Made with heavy-duty, highly water-resistant nylon, the Compression Sack from Sea to Summit compresses your belongings for easy stowage.. . Flip-Top-Lid design prevents strap tangling. Made of heavy-duty 210D PU-coated nylon. 4 straps for even compression; eliminates bulging. Extra long straps so its easy to fill these to max capacity. Nylon webbing pull handle on bottom. 6 liter bag compresses to 2 liters. 9327868001880 19343200025 171