I use these folders regularly for business presentations. For the most part I have had good luck. However on occasion I will get a package where the glue has spread out on the seam in the middle of the two pockets. This causes the pockets to be glued too small to fit a standard 8 1/2 X 11 piece of paper in either side. The only way to get the paper to fit is to rip open the glued part of the seam which most of the time ruins the folder. These come in a package of 10 and if one is glued like this than most of the rest of the package will be too. So order a package or two more than you will need.
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.