Using the Apidura Packable Backpack is easy. When you're riding, use the external mesh pockets for quick access to items like snacks. The 13 - litre main storage is great for bigger things like extra clothes or camping gear. After your ride, compress the backpack and store it in the on - bike pocket attached to your bike frame with the velcro strap. When it comes to maintenance, if the backpack gets dirty, hand - wash it with a bit of mild diluted soap. Let it air dry completely. Never put it in the washing machine, dryer, or iron it. The adjustable sternum straps can be set to your comfort level, and the roll - top closure allows you to adjust the bag's capacity according to your load.