Osprey Packs Atmos 50 Backpack


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Providing optimal ventilation without sacrificing comfort or support, the newly redesigned Osprey Atmos 50 Backpack carries your load closer to your back so you can log the miles like never before. This lightweight pack design certainly isn't the lightest on the market, but it the most comfortable and superbly detailed. Built with gender specific BioStretch™ Harness and Hipbelt for a secure fit and the AirSpeed Suspension system, the Atmos 50 can comfortably carry a load of up to 40lbs, making it ideal for active adventures, thru-hiking and superlight backpacking trips. Plenty of pockets keep you organized and dual hipbelt zippered pockets keep must-haves at your finger tips.


  • 210D Twill Velocity Cordura®, 160D x 210D Window Ripstop Cordura®
  • Airspeed Suspension system with LightWire Alloy Frame and 3D tensioned breathable mesh back panel with side ventilation
  • Gender specific BioStretch™ Fixed harness with mesh covered perforate foam and slides adjustable sternum strap
  • Gender specific BioStretch™ built-in hipbelt with mesh covered perforated foam and ErgoPull closure
  • Hydration compatible, backpanel sleeve with hanger and dual side hose exits
  • Floating top pocket
  • Front stretch woven pocket
  • 2 side stretch woven pockets with inner or outer compression
  • 2 zippered hipbelt pockets
  • Stow andGo™ trekking pole attachment
  • 2 ice tool loops with bungee tie-offs
  • Removable sleeping bag straps
  • Volume: 2800cu in / 47L (Sm), 3000cu in / 50L (Med), 3200cu in / 53L (Lg)
  • Weight: 3lb 4oz / 1.47kg (Sm), 3lb 6oz / 1.52kg (Med), 3lb 8oz / 1.57kg (Lg)
  • Comfort range: up to 40lb / 18kg

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Review Summary

4.9 out of 5

44 Reviews

  • Great design: 6
  • Performance: 6
  • Build quality: 5
  • Ease of use: 5

  • Cost: 2
  • reduced versatility: 1
Quality: 5 / 5
Durability: 4.5 / 5
Carrying Capacity: 3.8 / 5
Weight: 2 / 5

44 Ratings & Reviews

Durability: 4 / 5
Quality: 5 / 5
CarryingCapacity: 3 / 5
Weight: 3 / 5

from NY
55-64 yrs

November 07, 2010

I used the pack on the NFCT for about three weeks. A good solid pack. It carried extremely well when I needed it with excelent stability. ~3000 ci is a bit large for me (UL camper, mostly...,) but, with a 29 pound load for two weeks unsupplied, it was great. A couple minor cons about it. The "internal" frame gets in the way of the inner hydration pouch. I don't use a bladder, but I keep flat stuff(stakes, line, pot lid, extra maps, spoon, foil, etc) in there. It is larger than I need and the cross bar gets in the way when retreiving anything. Also, the top lid is a bit too small to hold a lunch, ready maps, and other small items (Impulse light, a couple "coin" cells, lighter, etc.) The side pouches have holes in them (often where I keep small stuff,) and I cannot use them to pack small items. And, it does not easily convert to a fanny pack for peak bagging. 50-75ci added to the lid would be an improvement. Male and Female clip buckles added would make it more usefull, letting it be used as a fanny pack. It often sat in a puddle of bilge water in the canoe, nothing inside ever got more than damp ...mostly due to the arched frame and padded waste belts. Because of this, I didn't use the belt pouches to hold small stuff. Soo, it looses a few points for versatility. At Baxter Park in Maine, it really shined when my daughter sprained her knee and I loaded most of her gear into this pack...it helped getting us out. It is really too small to make a good winter bag, so more than one tool loop is just excess weight IMHO. Removal of the center cross bar would also lighten the pack a bit. But, this would mean redesigning the suspension for it. Perhaps a smaller internal sleeve, above the crossbar, instead? Or, smaller gussets at the corners of the frame instead of one large bar in the center? For the size, it is a bit heavy. It should be down to 2.5 pounds or less. An ultra-light pack it is not. Light weight, for the size. These minor quibles aside, the added durability, carrying comfort, stability, and fair water resistance more than make up for the added weight in my book. For loads of 25-35 pounds, it is absolutely great and rates among the top three packs I have ever used...the best in that weight carrying range, despite it's own weight.

Pros: Great design, Build quality, Performance, Ease of use, Great value, Cons: reduced versatility
from Fairview, Or

June 23, 2011

I love this pack. Everything about it is great, but i am a hotter person so my favorite thing is the honeycombed breathable straps and amazing suspension system. This is the most comfortable i have used yet. I do wish that the pack had the rainfly coming out of the bottom


Durable, lightweight.
September 10, 2010

So far, this is my lightest backpack. Just started hiking again after 15 years and I found my old aluminium frame backpack. You can't even compare them! The fabric seemed stronger on the old one but after a search I realized it's the same strong but definitely much lighter! The design of the whole gear is excellent. I recommend this product.

virtually indestructable!
September 08, 2007

Ibought this pack in october of 2005. I have litterally wore this pac every day since. Because of inabillity to drive I have commuted on my freeride mountain bike in commbination with the bus since that date. My bike would always get handcuffed to the bus bike rack.on average I would be in and out of my pack at least 10 to 12 times per day.I wore it some much that the shoulder straps are starting to desintegrate. the only thing on this pack that has failed in all this time is the zipper on one hip pocket!!! I do think it is time for another atmos 50, but this one has been incredible! its a little tricky to load but after a time or too it is awesome! I would also recommend the rain cover for extra protection. I don't even use a suit case anymore for air travel.

November 26, 2009

Used it on a 25 day trip off trail in the Sierras. If not for having the "mandatory" bear canister I could have carried even more. I used the space in between the mesh back and the back panel to carry food, and other stuff. Fully loaded I was at 25lbs.

You need this pack!
August 19, 2005

I love this pack! The airflow system is great and keeps me cool. The unusual frame makes packing it a little different at first, but once you get used to it, it is no issue. I've tried so many different packs looking for a light weight that still felt sturdy enough. It has been a delight to wear this pack. Osprey's products are always good, but this one is something really special. If you are looking to trim weight and still carry everything you need, the atmos 50 is the ticket!

Great pack
July 07, 2010

I specifically got this Osprey pack for the airflow. Only a mesh screen rests on your back with the rest of the pack well off your back. I plan to use it for a bike camping trip and it is low enough to not interfere with a bike helmet.

September 01, 2007

The Atmos 50 is the perfect pack for everything between an overnighter and an extended backpacking pursuit. This is a great pack for keeping your gear lean and fast and at the same time being able to fit everything you need to keep things comfortable. I love the ventilation feature and the way it contours to my back. I would highly recommend this pack to moderate lightweight enthusiasts and anyone else exploring the idea of going lightweight.

Great Climbing Day Pack
March 02, 2009

Perfect for a climbing day pack. It can fit all of my gear. Make sure you get the correct size as it is very important. After about 50 pounds it starts to get a bit uncomfortable. The Atmos 65 would probably be better if you are camping and climbing.

Light and comfortable
March 07, 2005

Light, fast, and functional. At first, the extreme curvature of the frame stays seemed to detract from the useable capacity of the pack, but after some use, I've found it to be a non issue. The only gripe I had was a pressure point on my shoulder blade when I really loaded the thing down. This was resolved with a 5 minute "tweak" of the stay. Bottom line is this is the most comfortable pack I've owned, and I'm continually suprized by how much I can pack into it.

Great wekender pack!
May 23, 2006

Lots of adjustments make this a great pack to prevent sore spots. It's roomy enough for several days of stuff, but I doubt it is intended for long hauls unless you are a minimalist. The mesh backing is great for preventing sweat (and that matters a lot here in the Southwest. I rate this pack a 5.

July 11, 2005

The best! I now own six backpacks that will never be used again because of the Osprey Atmos 50. Thanks

Awesome pack
July 05, 2009

Nothing but good to say about this pack...I'm about to take it to the mountains in Asia!!!

Great pack, different than others i have owned, but great,,,
July 31, 2006

This is a pretty cool pack, very light, has lots of room for the essentials. Packing it is a little different from other packs, due to the way the internal frame is designed. I found I have to pack the outside pockets first, than do the inside, or else I have a diffucult time packing what I want in the outside pockets. All in all very light, and very comfortable. Would definitely buy again...

top of the line features and fit
May 23, 2006

This is an excellent pack! You cannot go wrong with the Osprey fit and construction. The Atmos line offers great features and support. Go by the sizing chart offered under the photo to make sure you get a good fit and make sure you load the pack correctly. This is a great lightweight pack that can be used throughout the Spring, Summer and Fall hiking seasons! Altrec.com and Osprey are a great combination!

Its True
January 05, 2007

As everyone else claims, this is a fantastic pack. Just bought it for a friend who can hardly wait to load it up and hit the trails. The mesh back is a great feature, as are the perforated hip and shoulder belts. Its super light, contours to the body and has plenty of room. A great choice!

from Dallas

Best pack i've ever owned!
November 10, 2010

You guys have created an AWESOME line of backpacks! I am packing to take a 4 day trip to Big Bend Nat'l Park, here in Tx. I'll be climbing a modest 7900' ridge to take in the view of northern mexico and will be staying overnight up there...can't wait to put the atmos 50 thru its paces...i'm certain it will amaze me. Thank you for the fast ship, i'll be doing more business with you soon. It wasn't inexpensive, but quality costs a bit more....! Best, rob

This is a really nice pack, but...
April 13, 2008

I am training to hike about 300 miles of the AT this summer. I picked up this pack in preparation for the hike. I have done several weekend trips for a total of about 50 miles, here are my impressions so far: Pros: Lightweight. Great frame design. Comfortable. Plenty of pockets. Breathable/keeps your back nice and cool. Convenient design for storing items in specific locations. Cons: Skimpy padding. Mesh side pockets get caught easily when "bushwacking." The design for keeping your back cool cuts into your internal storage space. All in all, this is a great pack. It carries 25 lbs. nicely but if you are trying to push 40 lbs. it will not be comfortable. If you are thinking about picking this pack up, you should. As long as you are trying to be a light packer and not carry a ton of extra stuff.

Very light, capable and versatile mid-size pack
August 11, 2010

I"ve only used it so far for long day hikes, and only with a bit over 30 lbs in it, but I'm impressed with how much more comfortable it is compared to my Osprey 33 and all my older internal and external frame packs with the same load on the same trails. The number, design and locations of the many quick-access pockets are very welcome features. At least four are accessible with the pack on your back. The "tuneability" of the various suspension and compression straps helps a lot with keeping the load fixed in the pack and getting the pack well-fitted to the user. I'm 5'10" and I"m using the medium size comfortably -- very little weight riding on my shoulders. This is the first of the vented back pad packs I've owned that actually keeps my back mostly dry. The fabric of the pack is very thin and light and looks like it may not hold up well to rough usage, but the Osprey 33 I mentioned above appears to have the same fabric and with three hard years of use on it looks new.

September 13, 2006

I have 80L, 90L and multiple 25L and below backs and was looking to get a 35L and a 50-65L to finish off the group. Through reviews and recommendations from friends, I started off with Osprey's Atmos 50. Glad I did, I really don't need the 35L version now (although I'm sure it's still a good pack). All the other good points listed in other reviews are true, my personal highlights for pros are as follows: top note for the waste strap, doesn't look like much at first(worried actually) until I put it on, smooth and very good distribution on waste (no pinching) and takes weight well. The little details of pouches in waste strap and user friendly front compartments was well thought out. The airflow system works as advertised, I'm a natural born sweater and where this doesn't eliminate the problem, it does reduce the problem more than any other backpack I've tried or seen on the market, good call boys! Nothing else unique on the pack, has all the other basics expected on a higher end pack. One and only concern is the durability, the materials are very light and construction is good, I fear that these new generation of backpacks (other companies switching to similar materials) are more susceptible to tearing on a branch or other gear during the trip out, but only time will tell. So until that tear happens, this pack makes giving a 5 easy. If you're looking for a 25 - 65L pack, save the trouble of time and money and pick this one up. Cheers and enjoy!


amazingly comfortable and versatile
November 22, 2009

I have covered many miles backpacking with this pack and have found it to be great. It carries a heavy load comfortably and can also be used as a day pack to carry water and snacks for exploration sidetrips along the way. The airspeed back was a good fit and kept my back cool and happy and the placement of the pockets and straps proved efficient. The redesign of the Atmos pack was a success with me.

April 26, 2010

Light, comfortable, great fit, great features, it's actually 100 cu in smaller than my previous pack but fits more gear because of excellent design. Super convenient pockets. And it looks great!

I Nearly Forgot I Was Even Wearing It
July 22, 2009

This is the best pack I have ever owned. I live in a wet climate and this pack exceeded my expectations even in this regard by keeping my items dry while still accessible. Extremely comfortable, and form fitting. This pack is definitely going to Mozambique with me!

Incredible fit and high quality
January 26, 2010

I tried a Gregory Z55 first, but just didn't feel comfortable. Atmos distributes weight perfectly with no pressure points. Shoulder straps are bulky. Great pack - my only regret is not getting the 65 litre version - it only weighs a couple ounces more and would be a better all around pack if you only have one.

Comfortable and Lightweight
August 19, 2007

I bought the Atmos 50 backpack for a day hike up Mt. Whitney. I wanted a lightweight pack large enough to hold rain gear, extra layers, water filter, survival gear, etc. This pack was plenty large enough to hold all my gear, weighing in at 15 to 22 pounds including 2-3 quarts of water and food. This pack is very comfortable. The shoulder and waist straps are easy to adjust, but I found the waist strap would occasionally loosen up a bit, thus requiring an occasional tug on the adjuster. My hiking buddy also experienced the slipping waist strap on his Atmos 50 pack too, so I wasnt the only one experiencing this problem. The breathable mesh back panel is awesome and keeps the back of my shirt dry. My CamelBak water bladder works perfectly with this pack. I usually hang it behind the mesh back panel to free up more space in the main storage compartment. One of my favorite features is the zippered mesh pockets on the hip belt, which provides easy access storage for my camera.

from Vegas Babby!

multi-day pack is an under-statement
April 12, 2011

lots, and lots of room and the air gap is AWESOME. Took it all around vegas and haven't filled it up yet. We have even put a Chiwawa in it and she loved it!!


Atmos 50 review
August 19, 2011

Atmos 50 makes a great day pack for someone needing a little extra room and appreciates comfort. It is a very comfortable pack and well made with lots of fittings and holds to handle all your tools and accessories.


Awesome gear!
November 05, 2008

This pack has all the bells and whistles. I recently used it for a 3 day hike on the AT in Va. It worked out great. I highly recommend this pack- one complaint would be tight side pockets for a water bottle, but no big deal if you use a hydration bladder. Always try on a pack before you buy - what works for one may not work for someone else.

Fits all my needs and more
March 23, 2009

This is a great pack, I would recommend it to anyone. I have plenty of room in it for my gear and then some. It is a great 4 season bag.

Nice pack
February 25, 2007

Purchased the Atmos 50 last November and tried it out on an overnighter at Pt. Reyes last month. I put inside a Marmot Pinnacle 15 degree down bag, a MSR Mutha Hubba 3 man tent, rain gear and pack cover, change of clothes in a medium size Granite Gear dry bag, and toiletry items. I strapped on a Big Agnes Dual Core sleeping pad to the outside of the pack. That helped make the pack stand upright a little better. My pack topped out at 25 lbs at the most and I had room left over in my pack. (My buddy carried the food and Jet Boil stove) I'm still trying to figure out if I can get my Bear Vault cannister in there somehow (strapping it on underneath the floating top lid seems to bonk my head at times) or if I need to get the Atmos 65 or Aether 70. Overall a great one to three nighter pack!

Comfortable and Lightweight
August 19, 2007

I bought the Atmos 50 backpack for a day hike up Mt. Whitney. I wanted a lightweight pack large enough to hold rain gear, extra layers, water filter, survival gear, etc. This pack was plenty large enough to hold all my gear, weighing in at 15 to 22 pounds including 2-3 quarts of water and food. This pack is very comfortable. The shoulder and waist straps are easy to adjust, but I found the waist strap would occasionally loosen up a bit, thus requiring an occasional tug on the adjuster. My hiking buddy also experienced the slipping waist strap on his Atmos 50 pack too, so I wasn’t the only one experiencing this problem. The breathable mesh back panel is awesome and keeps the back of my shirt dry. My CamelBak water bladder works perfectly with this pack. I usually hang it behind the mesh back panel to free up more space in the main storage compartment. One of my favorite features is the zippered mesh pockets on the hip belt, which provides easy access storage for my camera.

Nice hips
September 20, 2005

I compared this pack to a Gregory very closely before i purchased. The two packs sit very differently on your body. I like the Osprey because it sits squarely on the hips more like an external fram pack but without the sloppyness. The ultralight flexible frame moves the weight to the hip blet evenly. Gregory packs and many other internal frame packs put a bunch of weight onto the small of your back. This feels good at first, but for 20+ miles in one outing, put the weight on my hips please. As with any pack you might wander off into the world with, try it on before you buy it.

Terrific pack, fits great and very light
December 20, 2009

Haven't tried it out in the field yet, but this pack just fits much better than comparable packs from Gregory. Very light, plenty of space, and well ventilated.

You might just fall in love!
July 13, 2006

I did SO MUCH research before buying this, as it's my first pack and I live far away from camping stores. Out here on the Big Island of Hawaii it's great to have a pack that I can use for lightweight day pack adventuring, that keeps me dry, as well as for a few overnighters, camping or travelling without a problem. The red color is beautiful and shiney.I baby it a little...The zippers are alot tougher than I sometimes think they are, and the weight distribution is fantastic. I'm a five foot five female, weigh about 125 and love to jog and hike fast when I'm on the trail. I've gone down steep inclines, jogging, with this packed full, with an eight pound tent in it, and my back didn't hurt a bit, it's all distributed correctly. The numerous pocket options keeps me entertained, and I can disconnect the top compartment and put some little things in it if I don't want to carry the whole pack. It's also hydration compatable, can compress to a day pack or expand to what looks like and feels like more than the 3,000cu. I like the airflow back pocket for dirty clothes, or extra stuff, and the water bottle pockets are big enough to put other stuff in them too. Way cool pack, so glad I did the research and made this choice. Definately get the right SIZE tho.

Great Item
May 11, 2010

I love this one, it's so light, great color choice, durable, and has a fantastic design in terms of space usage and pockets. Highly recommend this one.

March 27, 2005

It has a plethora of goodness wrapped inside a light out of this world ectoskeleton that fight my back seamless. Kudos to osprey!


from St. Louis

The Best Weekend Pack for Backpacking and Travel
September 29, 2010

I've had this pack for well over a year and it has been the best purchase I've ever made for a weekend pack. I've used this for so many trips where I fly for a business trip, pleasure, or backpacking, and I can fit everything I need for the weekend: dress shoes, jeans, pants, sweaters, several t-shirts, and even my 15" laptop (although it does get tight, but I can still fit so much in the bag). The external dual pockets are very large and I can fill just one with power-cords, headphones, electric razor, paperback books, socks, sunglasses in a case, etc.). And the stretchy front pocket is perfect for fitting a lightweight rain jacket (i.e. Patagonia Torrentshell). Also, don't forget the nice feature of having pockets on the hipbelt to put your iPhon, camera, iPhone, or anything else you might need quickly. And finally, the most important part about this pack is that it's extremely light for its size and carrying capacity, and it truly feels so comfortable. I tend to have a bad back and not once have I ever had any pains carry this pack with over 30 lbs in it. The shoulder harness has a great amount of cushion and the octo holes in it and the hip belt keeps you from sweeting too bad (trust me it's not a problem in the winter, I've used it up in Chicago from Jan-Mar and I've never got cold from the feature)!

September 13, 2006

Great pack! I tend to weight myself down when I hike no matter how much I invest into ultralite gear but this pack makes it easy to carry. My hiking companions are amazed by how much I carry and how far and I tell them, "this pack makes it comfortable". I Love My Atmos 50. I use it for my daily commute here in Seattle as well as my multi day hikes in the Cascades.

Great Pack
September 29, 2006

Great pack, fits just right. Try it, you will love it!

this is a very good pack
August 22, 2009

This is an awesome pack...I'll be taking it to Asia this fall

Most excellent
January 27, 2008

The pack, like most are saying is a dream come true. It has everything you need and more for a quick nip into the backcountry on the weekend, and enough room for a longer trek. It is also great for hauling gear instead of a suitcase. My only concern would be the durability of the mesh backpanel and its longterm abilities to prevent back problems. I haven't had any problems on weekend trips, but on longer treks, 20 miles a day, for a few weeks, I noticed back fatigue I haven't noticed with other packs on similar treks.


The only pack for me!
May 19, 2010

This is the only bag I use when I travel. I have lived out of it for a week. It fits in the overhead on a plane and it doesn't hinder movement in crowded places.

Great pack, light and comfortable
October 01, 2009

I purchased the Atmos 50 backpack for a 3 day hike on Patagonia. The pack is comfortable, form fitting, and very light. It has lots of adjustments and plenty of room.

Awesome Pack!
November 14, 2007

I have used this pack more times than I can count! Everything I need for a 3-4 day hike. I just took it on a 20 mile hike through the Ouchita Mountains (around Arkansas/Texas/Oklahoma) for 4 days. Held my Tent (Marmot Twilight 2), Thermarest, Sleeping Bag (Marmot Sawtooth), 2 Nalgene bottles, a bladder for water, medkit, repair kit, about 10 pounds of food, and about 20 other gadgets on it! The Atmos was very breathable (The hikers I went with has large sweat stains on their shoulders and waist which made them cold the entire time and I did not!) Vey convienent pockets made the trek that much more easy and enjoyable! Very good buy and well worth the money!

Also Available

Osprey Packs Atmos 50 Backpack Photo

Glacier Blue, Graphite Grey and Oxide Red.

Available sizes, while supplies last, include size small, size medium and size large: s, m, l.

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