This bag fits perfectly on the passenger seat and backrest of my Honda Rebel 500. Lots of storage space and compartments to organize. The material feels durable and water-repellent. When I strap the bag on it folds up a bit making the flat bottom concave but for me this doesn't affect the functionality of the bag. Placing and removing the bag after initial strap adjustment takes me less than 2 minutes and is relatively painless, which is good for me as I only use it when I need extra space. When I have a lot of heavy stuff in my bag, I sometimes use a ratchet strap on the top of the bag to keep it secure.