The Staples #10 Left Window Gummed envelopes are a fine product. They are good quality. The only problem we have had with the envelopes is when they go through the Automated Postage processor. They tend to get stuck. I think part of the problem is the sealing strip. It does not go to the end of the envelope flap. We do several mailings each year and use the Staples #10 Left Window Gummed envelopes. They work for us. We buy all of our envelopes at Staples and are very satisfied with our choice.
I use these envelopes in my business for invoices statements etc. They are very convenient in that I don't have to print out address labels since they have the window. I have had a few problems with the glue not quite sealing on a few boxes that I've ordered. I don't know if there wasn't enough glue on the envelopes if it was faulty or what but they wouldn't seal no matter what I tried. Other then that though they work for what I need them for.
These White #10 window envelops are like Taylor-Made for our company application; they have been the best ever! They fit perfect for our multiple applications in our company. We have tried many other brands of #10 window envelops and they don't even come close to the Staple Brand of #10 window envelop. We are fully satisfied with these #10 window envelops and will recommend them to anyone who is looking for the best and most reliable brand of #10 window envelops. Just give it a try and you also be fully satisfied we did!