I recently used this for an 8 day ride in West Virginia, Kentucky and Virginia. All my clothes, Dopp kit, rainsuit, rain gloves, jacket liner, mapbooks, tools, etc. fit easily. The bag is quick to mount or remove at the hotel and totally waterproof. I rode for 2 days in pouring rain and nothing got even the least bit damp. The included mounting straps are secure but slightly difficult to remove but this is not a major problem. I really like that you can open the bag to access items and then reclose it without loosening or tightening the mounting straps.
Still riding after all these years