This pack is a favorite of the Navy SEALS. If it's tough enough for them, it's tough enough for anybody. Includes 100 oz (3 L) Mil Spec Antidote Reservoir Long with Quick Link. More than just a reservoir, the Mil Spec Antidote Reservoir redefines the ultimate delivery system for an operator's water supply and provides maximum adaptability for changing missions or combat environments. Includes our Quick Link Exit Port and QL HydroLock Bite Valve Adapter: tube clicks off for faster refilling with auto shut-off; new Fillport: industry's largest opening with air-light 1/4 turn open/close for quick, secure seal that can't be over-tightened; lighter-weight, lower-profile design. Independent Suspension harness and Air Director Back Panel for optimal load distribution and breathability; Adjustable compression straps for minimum or maximum compression; Lower drink tube exit ports for routing tube under arm; Noiseless zipper pulls throughout; External quick stash pocket; 500D Cordura Fabric.