Large size : 48cm*31cm*17cm,fit 15.6 inch laptop
Middle size : 43cm*26cm*12cm,fit 13 inch laptop
1 Inch = 2.54CM; 1 CM = 0.39 Inch.
Please allow 1-3cm (0.4~1.18″) differences due to manual measurement, thanks.
With USB: L
Without USB: M
Color versions without USB are Medium size M
Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.
About External USB Charge Computer Backpacks: