I buy a big box of these every ten years or so and had several of the old batch left when I bought the new ones. I could compare the old with the new. The new ones are made of a slightly lighter weight paper (maybe it's nominally the same) and have less glue on the flap. It is a bit harder to seal them and the envelope itself gets wet easier. I wonder if they'll find a way to squeeze a few more cents out of their production by the time I buy them again. I would have thought no one would be examining such a basic product for ways to cut corners.