I was excited to buy this because someone who likes mountain climbing offered to take me, and I used it once six months ago, but only for a short time, and haven't used it since. I only attached it to my waist, but there was a long belt inside, and I didn't know how to use it, so I didn't. The back is mesh. Size (approximate as it's difficult to measure): Width 35cm, Height 25cm, Depth 10cm This body bag has a simple design, but it also has pockets that can securely store your essentials. The adjustable strap provides a comfortable fit. I looked it up on Amazon and found that it's perfect for everyday use and outdoor activities, and it's also easy to match with casual styles. - Brand: AIGLE - Color: Blue, Green, Black - Material: Nylon - Number of Pockets: 1 outer pocket - Zipper: With main zipper - Strap: Adjustable strap - Design: Simple and practical