[Specifications] The size is 50cm * 33cm * 20cm. It weighs only 1.1 kg. It has so many pockets and works well with your carry-on when flying. Front top pocket has lots of room for shoes (as picture).Unzip the main area for more pockets, Very deep depth, can also be opened 180 degrees, it can store rolls of clothes.The computer compartment is the last zipper storage area. your 17.3" MacBook Pro fit in the back pocket easily. [Unique function] With external USB port, you can charge your mobile phone when carrying it, which is convenient to carry. How many backpacks offer a shoulder / chest cross strap, with a whistle? it has this function,it gives you a more secure feeling while walking, carrying other items, running, or on public transportation. there is a small zipper pocket on the Left Shoulder strap. Ideal for quick cash, credit card, ID, or to store your earbuds. [Appearance] The design of the backpack provides both a sleek and professional appearance.Excellent b