Using the Backsider Core 4 is a breeze. First, open the main compartment and start packing your daily essentials like books, notebooks, or a laptop if it fits in the hardware sleeve. The front pouch is great for small items such as keys, cards, or your phone. Adjust the EVA - lined shoulder straps to a comfortable position so you can carry it all day without pain. When it comes to maintenance, use a damp cloth to wipe off any dirt or stains on the exterior. Avoid using harsh chemicals as they might damage the backpack's material. Store it in a dry place when not in use to prevent mold or mildew growth. And remember, don't overstuff it beyond its 18.5 - litre capacity to keep it in good shape.