Using the Hydrobak Light is a breeze. First, fill the 1.5 - liter Crux Reservoir with water and connect it using the Quicklink disconnect. Put the pack on and adjust the adjustable sternum strap for a comfortable fit. You can store your basic essentials like keys, phone, or tools in the secure zippered pocket. When going on adventures, use the helmet carry and light loop as needed. As for maintenance, after each use, empty the reservoir and let it dry completely to prevent mold. Wipe down the pack with a damp cloth. If there are stubborn stains, use a mild soap. Store the pack in a cool, dry place when not in use.