Compress your gear into half the space. "Flip-Top-Lid" prevents strap tangling. Four straps with buckles allow for even compression and a handy grab handle on top for transporting. Unique self-storing pocket design stows sack into a small flat disc that takes up very little space. Material: 70D Nylon sides with 210D Nylon top and bottom. Size: 7" x 16" (10 L), 8" x 18" (15 L), 10.5" x 23" (30 L).