This bag is known as "Borderline" or "Aerolite" Cabin Approved Ultra Lightweight Luggage Bag, mine being the former - it's exactly as pictured on Amazon.
I purchase this bag for a short excursion to Holland unlike many of the reviewers here who brought the bag for a plane journey as it is cabin approved for many airlines including Ryanair.
The bag itself survived Train > Tube > Ferry > Train > Train > Amsterdam and back again. Each part of the trip involved much lifting of some sort, either onto a luggage rack on the train or up multiple stairs on the ferry or being dragged along the cobbled streets of Amsterdam. I carried the bag by the top handle, side handle and also trolley style and it's survived the journey without any damage - It did the job!
As mentioned in reviews, there are negative aspects to the bag; it doesn't stand in an upright position so will need constant support, small plastic wheels so it's very noisy on roads and pavements, a single telescopic pull handle which feels lightweight and is exposed inside and no inside straps for your clothes. If you are looking for luggage to survive you for many years to come and constant heavy lifting at airports, then look elsewhere - you should be looking a leather material or samsonlite type luggage.
I think the capacity is listed wrong as according to the manufacturer - it is expandable up to 41 litres as structure of the bag is collapsible so it is useful if you are planning to bring back more than you take with you.
The price of the trolley depending on when and where you purchased it, is approx £12-£20 which makes it one of the cheapest wheel luggage case available. If you are looking for a HQ trolley especially if you're a regular traveller then you should be looking elsewhere where you should be be spending £40+, however if you are in the market for a good value bag, then this bag is more than suitable - You get what you pay for!