Gregory Inertia 25 L Hydration Backpack - 3 L Reservoir - SEA BLUE (O/S )
Gregory Inertia 25 L Hydration Backpack - 3 L Reservoir - SEA BLUE (O/S ), Excess . Gregoryand#39;s Inertia hydration backpack is the perfect size for challenging days on your favorite trail. Designed with a 3D Hydro reservoir with plenty of room for extra layers if the weather changes. Available Colors: SEA BLUE. Sizes: O/S.