Gregory Inertia 20 Hydro Backpack


89.95 $89.95


Description: Gregory Inertia 20 Hydro Backpack

The Inertia 20 keeps a low profile and clean exterior that won’t slow you down as you tear up the trail. Bring a rain shell, hat, and gloves for changing conditions in the fall and spring, but leave your water bottle behind and fill up the included Gregory 3D Hydro reservoir.

Key Features of Gregory Inertia 20 Hydro Backpack
  • External Material: 100% Nylon
  • Pack Body: 210D Honeycomb CryptoRip Nylon
  • Pack Bottom: 420D High Density Nylon
  • Lining: 135D High Density Embossed Polyester
  • Suspension: Multi-Density closed & open cell foam
  • Includes 3D Hydro quick drying, soft molded reservoir (3 Liter) with integrated drying hanger
  • Dedicated zippered hydration sleeve with SpeedClip hydration hangar for a one-handed, snap-and-go connection
  • Die-cut shoulder harness with magnetic sternum buckle and hose clip for the Drylock bite valve
  • Breathable die-cut backpanel and removable webbing hipbelt
  • Sunglass QuickStow system on shoulder harness for quick, secure and scratch-free access to your shades
  • Top zippered pocket with key clip and front zippered pocket with soft touch liner to protect valuable items
  • Front and dual side stretch mesh pockets for quick storage
  • Trekking pole/tool attachment with bungee closure system
  • Custom comfort-grip molded zipper pulls and molded webbing keepers for strap management
  • Activity Day: Hiking / Hydration
  • Compartment Access: Panel
  • Closure Type: Zipper
  • Number of External Pockets: 5
  • Hydration Compatible: Yes
  • Hydration Reservoir Included: Yes
  • Reservoir Capacity: 3L
  • Hipbelt Included: Yes
  • Removable Hipbelt: Yes
  • Trekking Pole Attachment: Yes
Size 20L
Fits Torso 16" - 21” / 40.6 - 53.3cm
Weight 1.41lbs / 0.64kg
Volume 20L / 1220cu in.
Max Carry Weight 20lbs / 9.1kg
Packed Dimensions 20.1" x 11.4" x 8.25" / 51cm x 29cm x 21cm

4.8 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Just what I was looking for!
This pack is perfect for my day trips of hiking and mountain climbing in the Adirondacks.
August 26, 2019
Baldwinsville, NY
Originally posted at
Love this Hydration Pack
This backpack from Gregory turned out to be my new favorite day hiking pack. The 20L easily fits all my day hiking equipment with room to spare. The 3L reservoir is plenty of water for a day hike even on the warmest of days. What I also really like is the side pockets. They are very deep, so if you are on a shorter hike where you are not using the 3L reservoir, you don't have to worry about water bottles popping out of the side pockets (I've had other packs with short side pockets where water bottles fall out easily). The front mesh pocket is also large enough to hold all that "need now" type gear and there is a small quick stow pocket that is lined and perfect for storing glasses or sunglasses. Even loaded down with more than I'd usually take for a day hike, I found that with the multiple adjustment straps, this pack proved to be very comfortable and rode perfect on my back. I highly recommend this pack for day hikes and look forward to trying some of their larger packs in the future.
July 28, 2019
Huntsville, AL
Originally posted at
Best products on the market. #sweepstakes
Great packs. Wouldnt ever buy anything but gregory.
August 15, 2019
Pompey, NY
Originally posted at
Light weight hydration pack !
Inertia 20 in Orange is a very attractive looking light weight day pack with hydration pack . Its very easy to carry around . It has enough space for some snacks and packed lunch , a pair of clothes and a jacket . The shoulder straps and back support has a bit less cushion . I miss having the small zippers on the hip strap where I usually keep my chews and gums for easy access .
December 5, 2019
Originally posted at

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