Hydration is a necessity for full days on the trail, and no piece of gear does it better than the MXXY Hydration Pack. This innovative pack features a dual-chamber hydration system with one 1. 5L reservoir for water and one 750ml reservoir for electrolyte or supplement drinks. The control dial on the harness lets us adjust our water-to-booster ratio on the go, providing custom hydration for every leg of our ride or hike.