As someone here brought up nylon
Prada bags which I happen to agree are terrific, they are made from a type of nylon called Econyl; a recycled nylon which is amazing. It is used however on a multitude of products from the Adida line to other non designer items back to Prada. There are multiple articles that discuss it. It is an example of how pricing does not mean better quality. You can find things for a few hundred on up to a few thousand.
We need to recognize as consumers that most of us are willing to pay for the brand name. Luxury items do not promise to be better made or to last any longer than less expensive options. It's all designed to make you feel you are carrying a perceived prestigious item.
At the end of the day we want the cool creation, not some redo of last seasons bag, we want quality products, and we want to know what we are buying. Are we getting leather, some mixture of leather and PVC, coated leather, or something else. I do notice that the bags only imply the type of leather on the website which I never paid attention to until this thread.