The Evac Dry Bag from Sea to Summit is a waterproof and durable packing bag that is perfect for travel and your outdoor adventures. The bottom of the bag is made from breathable yet waterproof Event material, making the Dry Bag an optimal compression sack. This allows air to escape through the bottom when rolling and compressing, making it ideal for packing efficiently and saving space. The oval shape of the bottom prevents your belongings from rolling away. You can use the packing bag for storing clothing and sleeping bags, or as a waterproof sack in the main compartment of your backpack or on its own. With the Evac Dry Bag, your belongings will definitely stay dry!.