I've been buying these folders for years. Just recently I noticed a decrease in the quality of the folder. It's thinner and not always a smooth edge on the inside. Cheaper paper.
To describe these particular portfolios as "durable leather-like material" is completely untrue. I have had twin-pocket portfolios which I bought at Staples's stores and found these to be of an inferior quality. Many of them could not be used because of the poor quality and construction of the portfolios which I ordered online.
I use these folders to organize tax returns and source documents as they are presented to my clients. I attach a label to the front and include a business card inside.