Sea to Summit Ultra-Sil Compression Sack (X-Large / Black) 30L "Flip-Top-Lid" design prevents strap tangling 30D Diamond Ripstop Siliconized Cordura 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 XL - 10.5" x 23", 4.1 oz, 30 L to 10 L