Built for quick-hitting trail missions, the Inertia 18 H2O offers trail-ready hydration and practical comfort in a compact, go-anywhere design. With a breathable 3D foam backpanel and included 2-liter Hydro reservoir, this pack transitions seamlessly from mountain switchbacks to city streets—keeping your essentials (and your water) close at hand.

Key Features

• Includes 2L Gregory 3D Hydro reservoir with molded shape and leakproof bottle-style cap

• Zippered hydration sleeve with SpeedClip hanger for fast, secure reservoir setup

• Inline hose quick-disconnect for easy refills without unthreading the hose

• Magnetic sternum buckle with integrated hose clip and Drylock bite valve

• Perforated 3D foam backpanel with multi-density support and built-in ventilation

• Removable webbing hipbelt for added support when needed

• Zippered top pocket with key clip for small essentials

• Side zippered pocket and mesh bottle pocket for secure, easy access

• Reflective gear loops and trekking pole attachment system

• Custom ComfortGrip molded zipper pulls

Specifications

• Volume: 18L

• Weight: 1.22 lbs

• Max Carry Weight: 20 lbs

• Dimensions: 19.3" H x 9.8" L x 7.5" W

• Fits Torso: 16"–21"

• Fits Hips/Waist: 28"–48"

• Main Access: Panel

• Number of External Pockets: 3

• Closure Type: Zipper

• Hydration Compatible: Yes (Reservoir Included)

• Trekking Pole Attachments: Yes

• Hip Belt: Removable

• Materials:

  • Body: 210D/420D High Density Nylon with PFAS-free C0 DWR

  • Bottom: 420D High Density Nylon with C0 DWR

  • Lining: 40% Recycled 135D Polyester with C0 DWR

  • Suspension: Perforated Multi-Density 3D Foam

• Warranty: Limited Lifetime