Spend $200, Save $40—Use Code “AUGUST40
Home Page


When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
  • Current Steal

Inertia H2O 15L Backpack

4.125 out of 5 stars
8 Reviews
Current price: $55.96 Original price: $79.95
30% off
Color:Estate Blue



Inertia H2O 15L Backpack

Inertia describes a tendency of an object to do nothing, so you might be confused why the Gregory Inertia 15L 3D-Hydro Reservoir Backpack is the perfect thing for your always-active lifestyle. Well that confusion should clear right up once you put it on. It's designed with a supportive and comfortable suspension system that features breathable foam shoulder and hip straps, a breathable back panel, and load lifters at the yoke that adjust the pack closer to the body for a more supportive carry. Included in the pack is a 3L hydration reservoir that sits securely in its own pocket, and features an easy SpeedClip mounting system that makes it easy to install and remove the bladder.

When you need to reach for a windbreaker or rain shell you've got a buckled stretch mesh pocket that stores layers easily, as well as two stretch mesh side pockets in case you'd rather forgo the hydration system in favor of some good old fashioned water bottles. And the storage doesn't stop there thanks to the stowable trekking pole carrying system that'll help you fkeep your hands free on rocky summit slopes. There's also a convenient sunglass storage system on the shoulder straps, keeping your shades safe in a scratch-free environment without you having to take off your pack to stow them.


  • Compact and low-profile pack for easy storage on any adventure
  • Included 3L bladder allows for easy hydration whenever you need it
  • Padded and ventilated straps provide breathable comfort as you hike
  • Front stretch mesh pocket keeps a packable rain shell close by
  • Side mesh pockets allow for easy access to water bottles
  • Sunglass QuickStow system on shoulder strap keeps your shades safe
  • Stowable trekking pole attachment lets you easily stow your poles
  • Compression straps pull the load in closer for stabilization
  • Item #GRE00BC
Shoulder Straps
adjustable, ventilated EVA foam
Waist Belt
adjustable, webbing
Hydration Compatible
Reservoir Included
yes, 3D Hydro Reservoir, 3L
front panel
[external] 1 hydration, 2 side stretch mesh, 1 front stretch mesh, 1 front zippered, [internal] 1 mesh organizer
Gear Loops
Trekking Pole Carry
stowable attachment system
side straps
Claimed Weight
1lb 3.2oz
hiking, travel
Manufacturer Warranty
limited lifetime


Selecting an option will reload the available reviews on the page

Sorry, we don’t currently have any of those types of reviews for this product.