Genuine USMC SealLine Waterproof Sleep System Compression Sack
The three season waterproof compression sack provides waterproof storage of the Three Season Sleeping Bag (3SBag) and Improved Bivy Cover (IBC) components in the field and easily compresses their volume into a cylindrical shape to fit into the bottom of the ILBE main pack. Waterproofing is achieved by the fabric, bag construction and closure design. Volume reduction is accomplished by 3Sack shape, hands-free waterproof air purge valve, and two compression straps for simplicity that can be operated in low light conditions.