Using this sling bag is a breeze. Open the zipped compartments to put in your things like phone, wallet, and keys. For cards, use the 3 slots in the front zip compartment. Adjust the shoulder strap to your comfort by pulling it at the adjustable end. When you're done using it, close all the zippers to keep your items safe. As for maintenance, use a soft cloth to wipe off dust regularly. Avoid getting it wet as the faux leather might be damaged. If it gets dirty, use a mild soap and water solution, then dry it gently. Don't over - stuff the bag to keep its shape intact.