This is a waterproof bag designed to attach to a bicycle's rear carrier. It can be used as a shoulder bag or a backpack. I was using a backpack for my commute, but it got stuffy, so I switched to a carrier bag. However, it was a hassle to attach and detach, so I stopped using it after about a week. The bag itself is waterproof, and it also comes with an additional waterproof cover. - Color: Black - Accessories: Strap, waterproof cover - Pockets: Inner pocket only - Closure: Buckle type - Capacity: 20 liters Thank you for looking.