Using the Arkel Metropolitan 25 L Waterproof Urban Pannier is a breeze. First, use the Cam - Lock® mounting system to attach it securely to your bike rack. You can put your electronics, office gear, and other items inside the main compartment. For small items like keys, cell phones, or gloves, use the exterior pockets and the easy grab - and - go pocket. When you need extra space, leave the roll - top unrolled and use the top zipper closure. When carrying the pannier off the bike, use the comfortable shoulder strap. As for maintenance, keep it clean by wiping it with a damp cloth. If it gets dirty, you can wash it gently with mild soap and water. Avoid using harsh chemicals as they might damage the waterproof fabric and liner. Also, when not in use, store it in a dry place to keep it in good condition.