The DRYBAG, made out of premium 100% waterproof fabric is the perfect fitting the for HANG&ROLL. The Drybag can also be used on this own. It works perfectly as a carry bag. If you have an item that needs water protection or takes too much space inside the backpack, f.e. big sweater, pair of shoes or a big towel for the beach. Just throw it inside and take it with you!