Independent shoe compartment, USB interface, expansion bag, load reduction system, multi-compartment design, and water-repellent fabric. One pack is enough for large-capacity travel, replacing a 20-inch trolley case. Satisfy daily use, 7-day business trip. Reasonable separation of space, orderly storage, refuse to be disturbed and easy to accommodate, meet the needs of daily travel. The shoe bag is made of dirt-resistant fabric, separated from dry and wet, and can be used to store umbrellas, toiletries, and shoes; the zipper opening and closing method allows you travel more conveniently. Unzipping with one chain, the capacity can be instantly expanded to easily accommodate a 20-inch trolley case. The custom-made high-density fabric has a more wear-resistant texture and is impermeable to small water droplets, which can effectively protect personal items when wiped off. The three-dimensional mesh elastic foam back pad is comfortable and breathable, and effectively shock-resistant and load-reducing. After several adjustments and corrections by the designer, the shoulder strap design achieves a comfortable and relaxed carrying experience.