Waterproof with hot-weld waterproof tape on seams * Keep gear organized and color coded * White pigmented coating makes them easier to look into * Fabric construction makes them lighter weight than PVC * 7L: 1.8oz 4.5 x 7 x 17"; 10L: 1.9oz 5 x 7.25 x 20"; 13L: 2oz 5.25 x 7.75 x 21"; 18L: 2.75oz 6 x 8.75 x 22.5"; 25L: 3oz 7 x 10 x 25"; 33L: 8 x 11 x 27"