Ok, don't be fooled by the size of this. It's about 12 inches tall and if you fold the top flap down, you can rest the bag on a sheet of printer paper. But once you put stuff in it, it can expand a good 4 inches. Using this for hiking to toss in some energy bars, water bottle, keys, wallet, etc. You can switch the position of the strap if you want it resting on the right or left of the body. The zippers are fully funcitonal without defect, the material is solid, and it's comfortable. Highly recommend.