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