The closure mechanism on this bag is a zipper. There are several ways to carry this bag, one of them being a shoulder strap.
From SmartTeck
Techair TACMB001 laptop case 39.6 cm (15.6") Backpack Black, Grey -
EE Store
Techair Commuter 14-15.6 Backpack - Black
Tech Air
Commuter pro 14 – 15.6″ backpack grey