Using this top tube pack is a breeze. First, decide which mounting position suits your bike's frame size and geometry, then securely attach the bag to the top tube bolt bosses. You can use it to store items like battery packs and mobile phones. To access your stuff, simply use one hand to open the magnetic flip - top. When you're out on a gravel road, the closed - cell foam padding will keep your frame and electronics safe. If you need to charge your device while riding, use the protected cable port. As for maintenance, after each use, wipe the bag down with a damp cloth to keep it clean. Avoid using harsh chemicals that could damage the waterproof laminate. Check the mounting points regularly to make sure they're secure and the bag is firmly attached to your bike.