The material used to make this bag is ABS plastic. It comes in grey and it weighs just 2.2 kg, so it's a light little bag.
From Debenhams
Anode Cabin Suitcase 55x40x20 Built in Lock- Lightweight, Hard Shell, 4 Wheels, Combination Lock - Dark Blue - One Size
Robert Dyas
Cabin Max Anode 40L Cabin Case with Integrated USB Port and Built-in Lock - Graphite