??Invisible Expandable Capacity??This laptop bag features a invisible expandable capacity through a unique smooth zipper, you can unzip the smooth zip outsize when you need more rooms to package your stuffs, it will give your extra rooms to make your stuffs fitting well in the package ??USB Charging Ports Design??This laptop backpack is with a usb port outside to make you can conveniently power your phone while you are walking. Please note that you need a power bank placed in the backpack in which there is a usb cable to connect your power bank so that it can support powering your phone ??Ultra Slim and Light-weight??This laptop shoulder backpack is super slim and light, it is not big, it sizes only 11.5*2*17.5?? and weights only 0.7kg/1.54lbs. The slim body make you can put it in a narrow place and the light weight feature can help save your energy when you use it ??Invisible Pockets and Great Organizer?? The invisible pocket hidden beneath the back band of the backpack can conceal your phone, wallet or purse from the thieves. The shoulder band is built in a special pocket for your bus card, conveniently for your bus transport. Beside, It is a great organizer with good interior pocket structure, you can sort your stuffs into this backpack , like laptop, paper flies, small camera case, Bluetooth, key chains etc. ??Durable Leather and Nylon Material??This laptop bag backpack is made with microfiber leather and 1680 high density nylon fabric, which make it very durable, scratch-resistant and water-resistant. It is perfectly used for transport,travel, business trip etc and it is a perfect helper as a laptop backpack for men, women or commuters etc.