Using the Ortlieb Packman Pro 2 Backpack is a breeze. First, adjust the padded harness and waist strap to get a comfortable and secure fit. You can use the elastic zippered front organizer pocket for quick - access items like keys or snacks, but remember it's not waterproof. Put your valuable items in the interior zippered pocket. If you have a hydration system, connect the tube through the waterproof aperture. To store your helmet, use the stowaway helmet flap and tuck it into the front pocket. For packing, use the roll closure and compression straps to fit more items and reduce the backpack's size. When attaching a bike light, find the fixing point on the backpack. As for maintenance, clean the backpack with a mild soap and water after use, especially if it gets dirty or wet. Store it in a dry place when not in use. Be careful not to overload it beyond its capacity to avoid damage.