Product description YUMQUA MULTIPLE CHOICES Dry Bag, Your Perfect Water Sports Partner 5L dry bag: It is small in size, suitable for protecting small items such as wallets, keys, towels, glasses, and compasses. It is also very popular with children. 10L dry bag: It is a moderate size, suitable for short trips to pack small items. Suitable for protecting sweaters, toiletries, flashlights, mobile phones, notebooks, water bottles, etc. 20L dry bag: It is big enough to carry the items you need for a day trip. Suitable for protecting clothes, shoes, tablet PC, bath towels, binoculars, cameras, hand tools, food containers, etc. 30L dry bag backpack: It is suitable for traveling more than one day. Suitable for protecting more clothes, life-saving bags, parachute hammocks, ponchos, water containers, etc. 40L dry bag backpack: It provides gear protection for a trip that will last up to a week: two people's clothes, small sleeping bag, wetsuit, air mattress etc. About Shoulder Strap: 5L, 10L, 20L including a single detachable shoulder strap, which can be cross-body or shoulder-carried. 30L and 40L include double detachable shoulder straps, you can use one shoulder strap to cross-body, or use two shoulder straps as a backpack. About Shoulder Strap: 5L, 10L, 20L including a single detachable shoulder strap, which can be cross-body or shoulder-carried. 30L and 40L include double detachable shoulder straps, you can use one shoulder strap to cross-body, or use two shoulder straps as a backpack. About Shoulder Strap: 5L, 10L, 20L including a single detachable shoulder strap, which can be cross-body or shoulder-carried. 30L and 40L include double detachable shoulder straps, you can use one shoulder strap to cross-body, or use two shoulder straps as a backpack. About Shoulder Strap: 5L