Feature: PVC mesh cloth makes this storage pack a waterproof durable dry bag. Seamless sewing is uneasy to leak the water or air, which brings more waterproof guarantee when you are using this dry bag. The buckled opening makes it easy to get in and out of as needed. To keep water out, you just need to roll this dry bag correctly and then twist the ends once more to tighten the seal before making it buckled. If you are familiar with this process, it may only take up you several minutes to get it done. Folding bag will not take much space up, which allows you to carry it easily when you are prepare things for drifting, wading or swimming. 2L:As for the strap, this 2L dry bag comes without the strap, which is good for people who don't use the strap. 5L,10L:As for the strap, when you are holding this 5L/10L dry bag in your hands or shoulder it with heavy things inside, it is suggested to use the strap at first to reduce the pressure on your muscle. Makes it easier to carry the things and enjoys your travel Can be used for drifting, wading and swimming etc. Storage your beach towel, cellphone, change of clothes, camera and wallet and so on inside this dry bag. Places it in the water and let it float. And then your enjoyable travel will begin. Sport Type: Drifting, Wading, Swimming Material: PVC mesh cloth Color: Blue, Green, Yellow, Orange, Pink(option) Capacity: 2L, 5L, 10L, 15L, 20L(option) Size: 2L: 17 x 8 x 1cm 5L: 30 x 11.5 x 1cm 10L: 30 x 12 x 1cm 15L: 32 x 12 x 1.5cm 20L: 38.5 x 13 x 1.5cm Package List: 1 x Storage Bag