The WATERFLY Sling Chest CrossBody Bag Cover Pack Rucksack Foldable Shoulder Backpack is the waterproof bag you are looking for and it has a weight of 0.48 pounds and a capacity of 10 liters. You can use it when you're hiking, camping, on the beach, or heading to the gym. On top of that, it is made with soft nylon material, SBS zipper and YNS buckle. Since most of us live in homes where space is limited, this shoulder bag can be folded properly before being transformed into a large shoulder backpack. There is also a removable waist strap that you can use when running. In terms of capacity, there is a main pocket and four small pockets for your accessories. It is available in five different colors, namely blue, black, purple, olive and pink. Shoulder Backpacks WATERFLY Sling Rope Triangle Pack Daypack for Hiking or Multipurpose Backpacks and School Handbag. 5994.4/5$17.99