A luggage set and a cabin case are bought for different journeys. A three piece set covers a trip where luggage is checked in and the sizes nest for storage between trips. A cabin case is sized to go in the aircraft cabin and is bought on its own. Buying a set and a cabin case together covers both journeys rather than compromising on one.
Lock type matters where the destination requires it. A TSA lock can be opened by security without the case being forced, and cases are held both with and without. On routes where TSA applies, a non-TSA lock means a damaged case rather than a delayed one. Both lock arrangements are held in the same sets, so the case is chosen without changing colour or size.
Material sets the weight and the protection. Lightweight ABS is a hard shell that resists crushing while adding little to the allowance, which matters on airlines weighing cabin bags as well as hold luggage. A hard shell also protects what is inside from being crushed under other luggage in a hold.
Colour is more practical than it appears on a carousel, and the sets here are held in four. Cabin cases carry laptop compartments and dual locks, which is what makes them usable as a working bag rather than only as luggage. Send the journey to 07754288583 on WhatsApp. Dual TSA locks secure both zips rather than one, which is what a single lock leaves open. Colour is stated per set rather than being a range applied across all of them.