Using this Salsa EXP - R Series Gray Cattail Rear Top Tube Bag is a breeze. First, use the three included hook - and - loop straps to mount the bag securely at the top tube - seat tube junction of your gravel bike. You can put snacks like energy bars and tools such as tire repair kits inside the single compartment. Just unzip the bag with one hand whenever you need to access your items. When it comes to maintenance, since it's not waterproof, try to avoid exposing it to heavy rain. If it gets dirty, use a mild soap and a soft cloth to gently clean the bag. Hang it up to dry. Don't use harsh chemicals or machine - wash it, as this may damage the 1000D Cordura nylon material.