Cool bell CB 10001 Dual Type Laptop 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.