Name: Travel bag bag universal wheel double expansion large capacity Color: Blue, purple, yellow, Red Product size: 42*28cm/16.5*11.1in Expand one floor: 42*40cm/16.5*15.8in Expand two layers: 42*52cm/16.5*20.5in Material: waterproof Oxford cloth Weight: Each product weighs about 1350g 1. Large capacity design: The travel bag adopts double layer design and has large capacity space, which can accommodate more luggage items to meet the needs of travel. 2. Expansion function: Some designs may have an expansion function, which can be expanded up to two layers, which can expand a larger space and facilitate carrying more items. 3. Boarding size: In line with the airline's boarding box size standards, easy to carry and in line with aviation regulations, can be used as boarding baggage. 4. Dry and wet separation design: there may be a dry and wet separation function inside, which can separate dry and wet items and keep the bag clean and dry. 5. Fitness bag function: part of the design may be suitable for fitness bag, the interior space design is reasonable, can be placed fitness equipment, sports clothing and other items. 6. Portable design: Equipped with portable design, easy to carry, can be used according to the need to carry, carry or pull suitcases. 7. Universal wheel design: Equipped with universal wheel, 360 degree rotation, easy to push and pull when walking, reduce the burden of travel.