Very complex fastening system. The "base" that stays on the bike is large and difficult to apply (rings with straps like fastening a helmet). Also, the rings are in a position on the saddle that touches the inner part of the knees, causing discomfort in the dirt. When washing the bike, removing the base is time-consuming. The clips are small (if the suitcase is left on the floor and stepped on, they are likely to break). Also, the opening is a lid and then a very tight zipper (waterproof) that cannot be opened with one hand. The small waterproof pocket for the phone in the front and the transparent pocket on the top of the cover are very convenient. The carrying strap is NOT provided. The capacity is quite satisfactory, but it is not suitable for use in the dirt (also, it is not stable and balances left and right if it does not have a heavy load).