Gregory Inertia 18L H2O Hydration Pack Redrock, One Size

For day hikes where one water bottle won't cut it, we load up the Inertia 18L H2O Hydration Pack to stay equipped for a long day on the trail. The included reservoir stays secure in its dedicated zipper pocket, and the inline hose conveniently detaches for easy refills that don't require us to remove the hose from its shoulder harness.