Run through streams, jump over rocks, and hike mountains and the Nathan Triangle Hydration Waist Pak will stick with you the entire way. With the tilted water bottle carrying design, this hydration pack will stay snug against your waist and reduce bounce throughout your run. To keep the bottle down in the carrier, this does come with a shock cord that loops up to the nozzle of the water bottle. A zippered mesh pocket on the back of this can carry a phone, keys, or some food during your run. The Tru-Flex water bottle that comes with this pack is BPA free and can be washed in a dishwasher. The angled water bottle design of this pack will impress you with its comfort and the minimal bounce you will feel from your bottle on your run.