Coolbell CB-10001 Dual Type BackpackCoolbell CB 10001 Dual Type Backpack Brand: Coolbell Model No: CB 10001 Size: 15. 5 Type: Dual Backpack Material: Nylon Dimensions: 16. 5 x 4. 7 x 12. 2 inches; Fits up to 15. 6 inches laptop. Large capacity for keeping 2 3 days of summer clothes. Three carrying styles. You could use it as a backpack shoulder bag and messenger bag. Also, the straps can be hidden when you use it a messenger bag and shoulder bag.