Mountain Hardwear Fluid 18 Daypack

$60.47 109.95 save up to 45%
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When the route is technical and you're moving fast, the last thing you want is to overheat or get weighed down. Be light and nimble with the Mountain Hardwear Fluid 18 Daypack – it's small and simple with enough room for your day trip essentials.

The large main compartment offers a dedicated hydration sleeve and holds an essential rain or warm layer, while a security pocket and secondary compartment offer space for snacks, maps and other must-have items. You'll also find the large hipbelt pockets, stretchy side pockets and front compression pocket with stretch-mesh panels useful for storing everything from your sunscreen to your bike helmet. CoolWave suspension with air channels and breathable mesh back panels offer superb support and great ventilation when you're working up a sweat. The On-The-Fly compression allows you to adjust load stability while wearing the pack, without restricting motion.There are even loops to accommodate an ice axe or trekking poles and reflective tabs for added low-light visibility.

Auxiliary storage options and a dedicated hydration system give the Mountain Hardwear Fluid 18 Daypack a versatile, multi-sport personality.


  • Body: 100D HT Ripstop Dobby Nylon
  • Accent: 210D HexNut™ Ripstop Nylon
  • Bottom: 210D HexNut™ Ripstop Nylon
  • CoolWave Suspension with air channels and breathable spacer mesh backpanel and lumbar provides excellent load support and great ventilation
  • OTF (On-The-Fly) Compression lets user adjust load stability while wearing the pack without restricting motion
  • Large main compartment with internal security pocket
  • Front compression pocket with stretch mesh panels for overloads, helmet, etc.
  • Large zippered mesh pockets on ventilated hipbelt keeps essentials handy
  • Dedicated zip access hydration sleeve with dual ports
  • Reservoir not included
  • Super stretchy mesh side pockets offer quick storage/access for water bottles, hat/gloves, etc.
  • Ventilated and soft edge shoulder straps are comfortable on bare skin
  • Carry loops for ice axes and trekking poles
  • Reflective hits for high visibility and safety
  • Torso length: 16.0 in - 19.0 in, 41 cm - 48 cm (S/M); 18.5 in - 22.0 in, 47 cm - 56 cm (M/L)
  • Capacity: 1100 cu in, 18 liters (S/M); 1220 cu in, 20 liters (M/L)
  • Weight: 1 lb 8 oz, 680 g (S/M); 1 lb 10 oz, 740 g (M/L)

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Review Summary

4.3 out of 5

3 Reviews

  • Performance: 3
  • Build quality: 1
  • Ease of use: 1
  • Great value: 1

Durability: 4.7 / 5
Quality: 4.7 / 5
Carrying Capacity: 3.5 / 5
Weight: 1.5 / 5

3 Ratings & Reviews

Durability: 5 / 5
Quality: 5 / 5
CarryingCapacity: 4 / 5

from Northern NJ
45-54 yrs

Great pack
December 05, 2010

I love this pack. There are a lot of pockets to keep things neat. I use the main compartment for clothes. The next compartment has smaller pockets great for small items (lighter, nail clippers, etc.) This compartment is great for lunch, headlamp etc. There is also a fleece lined pocket on the outside for glasses, GPS, etc. The only complaint I have is that the waist belt pockets are kind of useless. They are to small for a small camera and to far back. I wish they re-designed the waist belt. I used this pack climbing the Middle Teton in early Sept. It was about 20 degrees when I started out from the Meadows. As I climbed, the pack held my Arcteryx Atom jacket and my base layer (top and bottom).

Pros: Build quality, Performance
Durability: 5 / 5
Quality: 5 / 5
CarryingCapacity: 3 / 5
Weight: 1 / 5

good pack
April 27, 2011

I use this pack mainly when I ride my mountain bike for a full day of riding. I like the fact that I can use my 3L osprey hydraform reservoir . Plus have room for food, light jacket, camera and the pockets inside are great for storing small stuff. When one uses the "OTF (On-The-Fly) Compression" it sucks the pack tight to my back and dose not flop around while I am riding my bike.

Pros: Performance
Durability: 4 / 5
Quality: 4 / 5
Weight: 2 / 5
from South Carolina
25-34 yrs

Good Day Pack
March 14, 2012

I bought this pack for day hikes with my wife since my Osprey pack was a bit overkill. It does not hold a ton but you can easily fit all you'll need. On a recent outting it held all our water, food, and our extra layers. The bladder pocket is easily accessed and fits most bladders. The side pockets work well for additional bottles. I wish the pockets on the hip strap were a bit larger. They will not hold a full size energy bar. Only a mini clif bar or Gu. But that is not a deal breaker. You can adjust on the fly which is nice and it is a comfortable fit. All in all it is a good bag and was worth the money I spent.

Pros: Performance, Ease of use, Great value

Also Available

Mountain Hardwear Fluid 18 Daypack Photo

Bay Blue, Black, Blue Chip, Crimson, Flame and Steam.

Available sizes, while supplies last, include size s/m and size m/l: s/m, m/l.

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