Multi-function computer bag: Can be used as a computer stand Can do mouse pad Computer bag 11/12 inches: 32 x 23.5CM 13 inches: 33.8 x 25CM 15 inches: 38.5 x 28CM 16/17 inches: 42.5 x 30.5cm (+ pen case plus 0.5cm length) Portable inner bag, thin, practical, not easy to deform. The foldable three-fold bracket-type inner bag protects the spine from a scientific perspective, and at the same time facilitates the heat dissipation of the laptop;. Strong magnet adsorption at the folded surface cover, it is not easy to open, and it can be placed horizontally and vertically without slumping. Velcro, portable design, prevent the notebook from slipping, and portable when going out. The pen cover at the end of the inner bag can be inserted into the office pen, and the functions are integrated into one bag; Note: If your laptop have case.please buy bigger size. for example: Mabcook Air 13 no case buy 13 inch.with case buy 15 inch