Granite Gear eVent Sil Drysacks Waterproof Stuff Sack Forms a block shape when compressed that stacks perfectly in your pack Simply roll to compress. Air is forced out the eVent bottom Arched rolling stay keeps Bloc open while loading/unloading and forms an easy to grab handle when sealed 7L: 1.2oz 4.5 x 7 x 17"; 10L: 1.3oz 5 x 7.25 x 20"; 13L: 1.5oz 5.25 x 7.75 x 21"; 18L: 1.7oz 6 x 8.75 x 22.5"; 25L: 1.97oz 7 x 10 x 25"