Gregory Inertia 18L H2O Hydration Pack Indigo Blue One Size. An included 2L Hydro reservoir and perforated 3D foam backpanel provide a complete hiking hydration system ready for all-day adventures. Specifications for Gregory Inertia 18L H2O Hydration Pack: Manufacturer: Gregory Gender: Male Age Group: Adults Pack Volume: 18 liters Pack Application: Everyday Carry Fabric/Material: 210D High Density Nylon Size: One Size Weight: 1.2 lb Features of Gregory Inertia 18L H2O Hydration Pack Dedicated 3/4 zippered hydration sleeve with SpeedClip hydration hanger for a one-handed snap-and-go connection Inline hose quick-disconnect coupling for easy refills without having to un-thread the hose from the shoulder harness Perforated shoulder harness with magnetic sternum buckle and hose clip for the Drylock bite valve 3D foam backpanel with supportive multi-density foam Removable webbing hipbelt Top zippered quick access pocket with key clip Side zippered pocket for on trail secure access and side mesh bottle pocket Reflective attachment loops and adjustable trekking pole attachment system Custom ComfortGrip molded zipper pulls Package Contents: Gregory Inertia 18L H2O Hydration Pack Gregory 141338-1439: Inertia 18L H2O Hydration Pack Indigo Blue One Size