Great condition US Military Issue Bivy cover is designed to use with or without the the modular sleep system and makes a great light weight camping and survival shelter.  Made to be 100% waterproof with Gore-Tex fabric and heavy duty YKK zippers it is tough enough to handle abusive weather. A Bivy cover is made to keep you both dry and warmer while sleeping outside your tent by acting as an additional heat barrier during winter and vent-able during the warmer months.  Military bivy covers can be used with any sleeping bag military or store bought and will last you a long time in the outdoors. Made of durably waterproof and windproof 3-layer GORE-TEX® fabric and approved by all departments and agencies of the Department of Defense Sealed seams for water and heat retention2-way YKK® zipper Mummy hood for total protection Fits military ECWS, intermediate and modular bag NSN# 8465-01-445-6274, Woodland Approximately  85" x 35" x 28"