These are great quality - weirdly this is one of the gripes I have with it. I have some cheaper packing cubes from away and they are more flexible than these. Interestingly the good quality materials makes them more rigid and adjust less to the shape of the clothes you put in them.
My away packing cubes also come with two zippers so you can compress the cubes when you pack them lightly and save some space (great for clothes where you don‘t care whether they wrinkle like socks etc.
I also feel they could be a bit higher to maximize the space used in the suitcase.
Overall still a great purchase but the pricing is priced way out of market. Save yourself some money ;)
