USMC Sleep System Waterproof Compression Stuff Sack - Large

Genuine USMC Waterproof Compression Stuff Sack - Large

Maximize your pack space and protect your vital gear from the elements with the authentic USMC Waterproof Compression Stuff Sack (Large, Type VI). Originally designed to house and tightly compress the military modular sleep system, this heavy-duty dry bag is an essential upgrade for backcountry backpacking, camping, and tactical loadouts.

Co-manufactured by SealLine (Cascade Designs) and Skilcraft, this sack goes beyond standard dry bags. It features a traditional watertight roll-top closure combined with an integrated one-way air purge valve. Once your gear is loaded and the top is sealed, simply kneel on the bag to force all trapped air out through the valve. The exterior flap and dual strap buckles then lock everything down, compressing bulky gear to a fraction of its original size.

Key Features & Design

• Authentic Military Surplus: Genuine U.S. military issue, built for extreme field conditions.
• Watertight Seal: Roll-top closure with a secure snap buckle keeps moisture, dirt, and debris out.
• Air Purge Valve: One-way valve near the base allows for maximum air evacuation without letting water back in.
• Extreme Compression: Exterior cap flap and adjustable webbing straps hold the sack securely in its fully compressed state.
• Rugged Construction: Built from heavy-duty, abrasion-resistant waterproof material designed to withstand austere outdoor environments.

Specifications

• NSN: 8465-01-608-7507
• Size: Large (Type VI)
• Manufacturers: SealLine / Skilcraft
• System Compatibility: Primarily issued for the USMC sleeping bag system, but excellent for any bulky sleeping bags, heavy clothing, or tarps.

Use & Care Instructions

• Operation: Fold gear to fit the long axis, roll top smoothly at least 3 times, connect buckle. Wrap exterior flap around sack, kneel to purge air, and tighten straps.
• Cleaning: Hand wash with mild soap and warm water. Hang and air dry only. If the purge valve clogs, flush with water from the inside out.
• Storage Warning: Do not machine wash or tumble dry. Do not store your sleep system tightly compressed inside this sack long-term (in garrison), as it can degrade the loft of your gear and the bag's waterproofing.