◕Easy and Steady Installation: bike rear bag fits with most bicycle rear cargo racks(4''-7''), such as mountain bikes, cruiser bikes, bikes, fat-tire bikes, and so on. ◕Great capacity for storage: The Bike Rear Rack bag has a very large capacity, so we can put a lot of stuff. It also has a waterproof design, which is very convenient for long-distance riding ◕Multifunctional Use: this bike rear rack bag can be a bike cooler bag, a lunch box, a cargo bag, and a shopping bag, it's also a shoulder bag with a removable, adjustable shoulder strap. After parking the bike, you can take this trunk bag with you and don't worry about it being stolen. ◕Compatible With Taillight For Safety: Reflective straps on the bike luggage bag provide good visibility and the strap at the back for attaching the rear light. You'll want to add some reflective items to your safety if you're a night rider. ◕ Protection for Bottle: The Bicycle Rack Rear Carrier Bag has a back pocket that keeps the water bottle secure on the back bike, making it stay in place