Using the Ortlieb Commuter Daypack City is a breeze. First, open the main compartment and organize your daily essentials like your laptop, notebooks, and clothes. You can use the front zippered pocket for things you need to grab quickly, such as your phone or keys. Attach your rear light and U - lock to the loops for added safety during your commute. Adjust the breast and waist straps to get a comfortable fit. When it comes to maintenance, wipe the pack with a damp cloth regularly to keep it clean. Avoid using harsh chemicals as they might damage the nylon fabric. If it gets wet, let it dry naturally in a well - ventilated area. Also, make sure not to overload the pack beyond its capacity to prevent damage to the reinforced underside and straps.