Kodiak Window Dry Bags feature a translucent TPU window that lets you see into the bag without sacrificing privacy, as well as a new hands-free, one-way purge valve* that offers increased compressibility and is flexible and flush to prevent snagging. They also boast an improved roll-down closure for a watertight seal, and a heavy-duty round bottom that lasts long, maximizes storage capacity, and stands upright to make packing easier than ever. These bags are made of tough, lightweight nylon and are available in seven sizes to fit every dry storage need. *Not available in Kodiak Window 5 and 10 models. Kodiak Window 40 Purge: Weight: 11 oz./310 g Volume: 2400 cu. in./40 liters Size: 13 x 25 in./33 x 64 cm Color: yellow or blue Kodiak Window 30 Purge: Weight: 9 oz./255 g Volume: 2000 cu. in./33 liters Size: 11 x 25 in./28 x 64 cm Color: yellow or blue Kodiak Window 25 Purge: Weight: 8 oz./230 g Volume: 1530 cu. in./25 liters Size: 9 x 26 in./23 x 66 cm Color: yellow or blue Kodiak Window 20 Purge: Weight: 7 oz./198 g Volume: 1220 cu. in./20 liters Size: 9 x 20 in./23 x 50 cm Color: yellow or blue Kodiak Window 15 Purge: Weight: 6 oz./170 g Volume: 900 cu. in./15 liters Size: 8 x 20 in./20 x 50 cm Color: yellow or blue Kodiak Window 10: Weight: 5 oz./140 g Volume: 630 cu. in./10 liters Size: 8 x 15 in./20 x 38 cm Color: yellow or blue Kodiak Window 5: Weight: 3 oz./85 g Volume: 300 cu. in./5 liters Size: 7 x 10 in./18 x 25 cm Color: yellow or blue