The main bag and multiple combination bags can easily accommodate items such as 15.6-inch laptops, mobile phones, books, iPads, clothes, umbrellas, water cups, etc. The external USB connection port enables you to listen to music easily. Environmentally friendly non-permeable fabric, scratch-resistant, wear-resistant and tear-resistant. Multi-layer reinforcement design, enhanced carrying capacity. Reinforced shoulder straps, strong load-bearing capacity. Designed according to the principles of ergonomics, comfortable and fitting. Foam back pad, breathable, pressure-reducing and shock-resistant.