This bag is very convenient as it can be attached to a motorcycle as a pannier bag and then used as a backpack. The waterproof function is, as expected from Ortlieb, excellent. I purchased it around 2023 and used it for about six months. After selling the motorcycle, it was stored in a warehouse. I'm listing it now during an inventory check. I will also include the separately sold QL2.1 20mm attachment for the bar.