High energy activity requires keeping hydrated thats why the viper backpack comes equipped with an integrated 25l hydraulics lt reservoir so you can push yourself to the limit the reservoir is accessed via an asymmetric zip for quick and easy refills the reservoir incorporates 2 chevron welded baffles to help maintain shape when full and limit sloshing from the water osprey have also solved the wandering hose issue by placing a magnet in the pack sternum strap and bite valve this hold