The FlatPack is a purpose-built assaulter pack with over 8-years of direct-action experience in the hands of U.S. and NATO Special Operations Forces. The distinctive zippered expansion system enables the FlatPack to convert from nearly flat when compressed to an additional 150% of storage volume when fully expanded.Features :MIL-SPEC 500D nylonMIL-SPEC woven elastic"1" Buckles (Male/Female),VELCRO Brand loopYKK zipper