Multiple Size: 5L waterproof bag is ideal for fishing, water parks, gym, music festivals and can hold valuables such as mobile phones, watches, wallets, sunscreen, olive oil, fishing gear etc. The 10L and 20L are suitable for kayaking, rafting, canoeing, swim, camp and beach fun and can hold some clothes(10L for summer clothing/20L for winter clothing), beach towels, hats, gloves, torches, food and water. Premium Quality&Professional Waterproof Dry Bag Adjustable Straps Multiple Use Professional Waterproof Coating Three layers of premium quality fabric with a professional waterproof coating, that your items will be dry and clean. The durable fabric also tear and puncture resistant, and will not break easily even when you hit hard rocky cargo rock faces. Adjustable Straps With a detachable and adjustable shoulder strap for carrying or slung to carry around. 1 strap for5L/10L 2 straps for 20L) Multiple Use Can be carried by hand or slung, easy to travel with, suitable for summer activities like kayaking, boating, rafting, canoeing, swimming, camping, beach fun, fishing, water parks, music festivals, go to the gym, hiking, etc. Use Instruction Please use the waterproof dry backpack according to the use instructions in order to perform the function of the waterproof dry sack. Various scenarios Ideal for Summer Ideal for Summer! This professional waterproof storage bag with shoulder strap is not only for everyday use, like camping, music festivals, hiking, go to gym and can help you to store your valuables or clothes when you enjoy summer water sports such as boating, snorkelling, kayaking, motorboating, canoeing, swimming, fishing, beach fun.