Looks like Classic Travelling Luggage - I have similar. Got its debut on the way to Mogfest …
Designed to fit perfectly and they have multiple materials, edging colours and handle types. So can spec to match the car. Not cheap but nice product and works well. Eg at 6’7”, I have my seat back the maximum and the bag still fits nicely behind it. Also the trapezoid shape gives maximises the depth available so you can actually fit a reasonable amount in each one.
https://classictravellingluggage.com/product/morgan-plus-four-suitcases/
