Description of Sea to Summit Ultra-Sil Compression Sacs Stuff sacs where you need them. Features: Made of Ultra-Sil™ nylon, a polyurethane coated Siliconized Cordura® for ultimate waterproofing and maximum durability "Flip-top-lid" design prevents strap tangling 30D Diamond Ripstop Siliconized Condura 4 straps for even compression Extra long straps so these sacks can really be filled to capacity Bar tack reinforced stress points Pull handle on the bottom Slippery finish for easy packing S: 7" x 16" 10L to 3.3L M: 8" x 18" 15L to 5L L: 9" x 20" 20L to 6.5L XL: 10" x 22" 25L to 7L Assorted colors may vary