New! Gregory Inertia 18 H2O Daypack

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Meet the Gregory® Inertia 18 H2O Daypack, where comfort and convenience collide. An included 3D Hydro reservoir and perforated 3D foam back panel provide a complete hiking hydration system ready for all-day adventures. This backpack comes with a 3D Hydro quick-drying, soft-molded, 2L reservoir with integrated handle and drying hanger. The 3D Hydro reservoir goes inside its own dedicated 3/4 zippered hydration sleeve with SpeedClip hydration hanger for a 1-handed, snap-and-go connection. The convenient inline hose quick-disconnect coupling provides easy refills without having to un-thread the hose from the shoulder harness. The perforated and ultra-comfortable shoulder harness comes equipped with a magnetic sternum buckle and hose clip for the Drylock bite valve. The 3D foam back panel with supportive multi-density foam combines with the removable webbing hip belt for extra hiking comfort. Pockets include a top zippered quick-access pocket with key clip, a side zippered pocket for on trail, and a secure access and side mesh bottle pocket. Reflective attachment loops and adjustable trekking pole attachments. Custom ComfortGrip molded zipper pulls. This Gregory backpack has a body that's made of 210-denier, high-density 100% nylon and 420-denier, high-density 100% nylon with a durable water-repellent (DWR) treatment. The pack's bottom is 420-denier, high-density 100% nylon with a DWR treatment, and the lining is constructed from 40% recycled polyester/60% polyester with a DWR treatment. Imported.
Manufacturer model #: 141338.

  • 3D Hydro quick-drying, soft-molded 2L reservoir
  • Dedicated hydration sleeve with hydration hanger
  • Inline hose quick-disconnect coupling
  • Perforated shoulder harness with magnetic sternum buckle
  • 3D foam back panel with multi-density foam
  • Removable webbing hip belt
  • Top pocket with key clip
  • Side zippered pocket
  • Reflective attachment loops
  • ComfortGrip molded zipper pulls


  • Adjustable torso: Yes
  • Fits Torso: 14"–19"
  • Fits Hips/Waist: 27"–45"
  • Weight: 1.22 lbs.
  • Volume: 1,098 cu. in. / 18L
  • Max Carry Weight: 20 lbs.
  • Packed Dimensions: 19.3"H x 9.8"W x 7.5"D
Web ID: 101401732