The closure mechanism on this bag is a zipper. You use a top handle to carry it.
From Ecprof
GX40Q17232 - GX40Q17232-Toploader bag-39.6 cm (15.6)-Shoulder strap-43
Conrad Electronic
Lenovo Laptop bag Casual Toploader T210 Suitable for up to: 39,6 cm (15,6) Camouflage green