Free shipping! Anonymous delivery! Shipped via Yu-Packet Post Lightweight and durable nylon side pocket for school backpacks! Convenient zipper. - Brand: devirock / Devilock - Color: Blue Gray - Inner material: Nylon I bought this to attach to the side of my school backpack to hold a water bottle or recorder, but before it arrived, I realized that I didn't have the straps to attach it to the backpack, and I haven't even opened it.