The Boyue bros has developed a casual backpack with a USB charging port and a multi-layered pocket design. Available in four colors, this backpack is great both for daily use and for short trips. The back offers supportive pads and a luggage belt, which makes carrying this backpack easier. On one of the straps, the bag sports a hidden zipper pocket, appropriate for storing a smartphone or ID cards. This polyester backpack has a large capacity, carrying up to 55 liters. The main compartment features a layered pocket design, leaving enough room to store clothes, books or other personal objects.