Original design, patent protection, the front opening design interprets the ability of travel, the simplicity and lightness of travel. Large-capacity inner village, 3-layer partition with dry and wet separation, zipper closed design, better privacy, can be placed in a 15.6-inch computer. Metal iron pull rod, stretches smoothly, and the gear can be adjusted to suit different heights. High-precision metal bearings, the heavier the smoother, the wear-resistant and shock-absorbing 360° rotation. Three-digit fixed security combination lock to ensure safe travel and worry-free loss of items. There are two different ways to unpack the front cover, you can choose 20 inch/24, choose your favorite unpacking method , it is safe and convenient to travel. Function: Waterproof, board the chassis, and open the front cover Size: 20 inches, 24 inches Cover opening method: Zipper Internal structure of the bag: Zipper pocket, mobile phone pocket, certificate pocket, sandwich zipper pocket, computer pocket, camera pocket Applicable occasions: Tourism, business