Tethrd FAS Pack Coyote 1000 cubic inch main pocket;600-800 cu in additional storage (top lid and side pockets);More additional storage when combined with the Compression Kit;The main body is constructed of 500 D Cordura and Squadron B-52 materials;YKK zippers throughout;?Pass through? top lid;HDPE internal frame sheet with aluminum stay designed to be custom shaped to fit your back;Padded air mesh back;Lined with STRATA micro-fleece