The ArmorBak Mil Spec Crux Short Backpack 3L from is a 3 liter drinking system from 's Maximum Gear Line with room for an additional 3 liters of gear. The system is made 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 the height as it is attached directly to the vest. The backpack is Mil-Spec approved and can be used with Antidote fluid bladder as well as all other well-known functions from , including Quick Link exit ports and HydroLock bite valve.