Official USMC Military SealLine Waterproof Dry Bag Sack 65 L Official USMC Military SealLine Waterproof Dry Bag Sack 65 L Capacity: 65 Liters/3966 cu. in Extreme Durability: 210D oxford nylon with high-tenacity polyurethane coating Air-Tight Compression: Manually operated lightweight purge valve with 1000lb crush rating Light Weight: The best combination of light weight and extreme durability for a wide range of uses