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 ( Because it is manual measurement, there may be an error of 1-2cm, it is recommended to choose an inner bag with a large capacity, because you may need to store your charger or other) Excellent protection: The materials of all portable 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, bumps and shocks. 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 splash or rain to wet your precious 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 light 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. Scenarios for multiple applications: our elegant case is slim and light, which is very suitable for men , women, girls or university in business, travel, work, school and other occasions.