[ INVISIBLE EXPAND ] : Dimensions: 17.7 x 12.6 x 4.7 ~ 7.1 inches, capacity: 18L ~ 26L. Expandable backpack has smooth zippers on side. Once pull on the zipper, bag will offer large capacity up to 26L for you to store more stuffs (Laptop pocket size: 15.7 x 11 x 1.2 inches)
[ DOUBLE PROTECTION ] : FENRUIEN armored laptop backpack is made of high-density waterproof PC&ABS hard shell and oxford fabric (zippers are not waterproof). Thickened pearl cotton and soft polyester lining will protect your laptops from shock and scratch
[ TSA FRIENDLY FEATURE ] : The lightweight travel backpack with scan smart technology can be freely opened 90-180 degrees, allowing you to quickly pass the airport security check and keep your things tidy. TSA customs lock can protect your items from thieves(Please don't set a password before reading the instructions)
[ ERGONOMIC DESIGN ] : Adjustable anti-slip breathable S-shaped mesh shoulder straps with plentiful sponge help relieve the stress from your shoulder. 3D honeycomb breathable back cushion can reduce the sultry feeling of the back
[ SMART USB PORT ] : Built-in removable charging cable is convenient to charge your cell phone by connecting your power bank, this tech backpack can free your hands from power bank (Power bank is not included)