It's convenient because it has many storage pockets, allowing for organized storage. On the outside, there's a zipper pocket and a pocket with a Velcro flap. The middle section's double-zipper pocket has a divider in the center, with a mesh pocket with a zipper on the front, and two pen pockets and two open pockets on the back. There's also a double-zipper pocket on the top section. The back is cushioned to prevent discomfort. Adjustable straps are on both sides to prevent sagging. It has a good amount of depth, so you can store a lot. Size: Height: 17cm Width: 23cm Depth: 13cm