✅ Reasonable layer, scientific storage, simple body and not redundant, suitable dividers inside and outside, easy storage, improved efficiency, for storing laptops, wallets, notes, mobile power, mobile phones, iPad, headphones and umbrellas ✅ Hidden zipper pocket on the back fits the wearer's back securely and anti-theft and holds valuables such as wallets ✅ Simple, versatile and elegant business, business trip, leisure travel, daily work ✅ Thoughtful design, save your worries and effort, there is a roller strap on the back, the backpack can be placed on the trolley and the two combine into one. When traveling, the backpack and suitcases can be easily carried together, saving strength and making the trip more Breathable 3D back cushion, comfortable and decompressing, according to ergonomic design, evenly distribute stress points, reduce the burden and take care of your waist and cervical spine The USB interface helps you extend the battery life during the fast time, and it is more convenient to charge while walking Waterproof technology: daily waterproof, effectively react to sudden light rain while driving and prevent rainwater penetration. Protect the contents of the bag from water damage Explosion-proof zipper; Adjustment of the chain fabric protected against explosions; adapted material slider, soft traction and no tooth jamming ✅Exquisite workmanship: the seams of the whole body are even and tidy, and the bearing parts are reinforced, which is firmer to use and ensures the quality Thick accessory, thickened T buckle with lid, after pressing the flap, there is a fixed strap to prevent slipping