ArmorBak Mil Spec Crux Short Backpack 3L from CamelBak is a 3 liter drinking system from CamelBak's Maximum Gear Line with space for an additional 3 liters of gear. The system is manufactured specifically to be attached to the back of a combat vest with MOLLE / PAL back panel. This drinking system is easy to attach and minimizes height as it attaches directly to the vest. The backpack is Mil-Spec approved and can be used with Antidote fluid bladders as well as all other well-known features from CamelBak, including Quick Link exit ports and HydroLock bite valve.