The Gomatic 20L backpack is designed for everyday use. It is made from durable, waterproof materials and features YKK zippers. This bag is slim but can be expanded by 20% to 24L when you need to pack more. The strap system allows you to transform the backpack into a briefcase when you need to look more professional. The continuous zipper, magnetic water bottle pockets, RFID-safe storage, and hidden pockets are just a few of the over 20 remarkable features that make this backpack a functional choice!