A shopping trolley is a good invention in itself. One that can be folded on top of that? Even better! At least if you want the option of making it smaller.
This is integrated in the foldable trolley from reisenthel: It can be folded three times and packed into a bag. This makes it particularly easy to store when not in use.
When you buy it, the trolley is folded up and stored in a bag. When you open the zip of the bag, you can see what's inside: the main compartment, two wheels and the legs. Everything can be easily unfolded. Turn the bag over, close the zip of the bag again, and the trolley is ready for use!