Looking for a new backpack? This might be the thing for you. One of the materials used to make this bag is polyester and it has a volume of 22 litres.
From OnBuy
Targus CitySmart 15.6 Backpack Black,Grey
Technoworld PLC
Targus CitySmart notebook case 39.6 cm (15.6") Backpack case Black, Grey
This product is also available at 4 unverified stores.