Using this men's 20L medium surf backpack is easy. First, separate your wet and dry items. Put wet things like wet suits in the wet compartment and dry stuff like wax and accessories in the dry one. The side water bottle holder is perfect for keeping a water bottle handy, so take it with you and make sure to drink water regularly. When it comes to maintenance, after each use, if the backpack gets wet, wipe it dry with a clean cloth. Let it air - dry in a well - ventilated place. Avoid leaving it in direct sunlight for a long time as it may damage the material. Check the zippers regularly to ensure they work smoothly. If there are any small stains, you can use a mild detergent to clean them.