This is a cabin bag made using polypropylene. With its hard casing, it's easy to clean and it weighs just two kg, so it's a light little bag.
From Selfridges
Samsonite Metallic Green C-lite Spinner Hard Case 4 Wheel Cabin Suitcase 55cm - METALLIC GREEN
John Lewis & Partners
Samsonite C-Lite 4-Wheel 55cm Expandable Cabin Case