The closure is made super-easy with a zipper. There are several ways to carry this bag, one of them being a shoulder strap.
From Eleonto
Case Logic 15,6 Notebook Case Black | Laptop Bags | eleonto
Technoworld PLC
Case Logic VNCI-215 Black notebook case 39.6 cm (15.6") Messenger case
This product is also available at 3 unverified merchants.