These are the best innovation since self sticking stamps. When you had to lick the envelope or use a water bottle w/sponge they never really closed well.
I'm a photographer who needs to mail out orders of 5x7 photographs. Several years ago I tried another 6x9 white catalogue envelope but they weren't very good for my particular application. After that experience I switched to the 6x9 manilla envelopes with the clasp closing. They worked fine but I always felt that I had to put tape on them. When I went to Staples to get new ones I saw the white wove easy close catalog envelopes and purchased them. They are perfect! It took me so much less time to pack and seal my orders with these envelopes and they look so much nicer than the standard manilla ones that I've been using. I'm very happy that I found them and I'm quite sure that this is the envelope that I will use from now on.