Size (unit is cm/g) 11.6 inch outer (34cm*23cm*3cm) inner (32.5cm*21.5cm*2.5cm) 300g-400g 12.5 inch outer (34cm*23cm*3cm) inner (32.5cm*21.5cm*2.5cm) 300g-400g 13.3 inch outer (36cm*26cm*5.5cm) inner (35cm*25cm*5cm) 300g-400g 14.1 inch outer (39cm*28cm*5.5cm) inner (37.5cm*26.5cm*5cm) 400-500g 15.4 inch outer (39cm*28cm*5.5cm) inner (37.5cm*26.5cm*5cm) 400-500g 15.6 inch outer (43cm*32cm*6cm) inner (41.5cm*30.5cm*5.5cm) 400-500g (As it is manual measurement, there may be an error of 1-2cm, it is recommended to choose a large capacity inner bag, as you may need to store your charger or other things) Excellent Protection: The materials of all laptop bags include thick foam and super soft velvet lining, including zipper edges and inner edges. The extra thick pads in the corners can provide 360° protection for your computer to prevent accidental scratches, bumps, shocks, and impacts. The surface of the sleeve shell is made of waterproof Oxford fiber. If it rains, it can effectively block water and steam. Don't worry about splashes or rain to wet your valuable Macbook or matebook or surface. Well-Organized Pockets: Large space capacity, can be neatly placed charging, mouse, power, mobile phone, pen, card and other accessories. and easy to carry, this messenger bag can hold screen sizes up to from 11.6-17 inches, such as 11.6 - 17.3 MacBook Pro, Dell, Lenovo, most Chromebook, Ultrabook (Acer / Asus / Dell / Fujitsu / Lenovo / HP / Windows / Ipod / Netbook / Toshiba etc.), may not fit all computers due to variations in the sizes of different models. Multiple Application Scenarios: Our elegant case is slim and lightweight, which is very suitable for men, women, girls or university students in business, travel, work, school and other occasions.