Using a zipper to close a bag is as easy as it gets. This particular bag is made from polyester.
From OnBuy
Dicota Eco Slim Case BASE notebook case 35.8 cm (14.1") Grey
Yes Infotech
Eco Slim Case Base - 13-14.1in Notebook Case - Grey / 300d Rpet Polyester
This product is also available at 5 unverified stores.