Capacity - 100 oz (3 L) The M.U.L.E 500 is the most efficient way to carry your water and gear, and can now be attached directly to the back of your body armor by using the Open Gate Keeper Clips of the Direct Armor Attachment System (D.A.A.S.). 35% Lighter weight 500D Cordura. D.A.A.S. allows pack to be attached directly to IOTV or MTV without interfering with the rapid removal mechanism. Updated Air Director Back Panel for better ventilation. 3/4 length zipper gives better access to the 100 oz OMEGA Water Beast reservoir.