I bought the same size #9 envelope thru Quill and they don't seal when I put it thru the postage meter. These Staples brand are great never have a problem with sealing then and I can save money with my Reward coupons. Its worth the extra trip to the store to pickup a box or two.
We use these envelopes a lot at our company. We use them for our invoices and employee checks. There is not a day that goes by that we do not use them. They come in very handy.
I bought these envelopes because they fit our invoices perfectly. The double windows allow both our address and the customers are clearly visible. The price per box was $15 less than what we were paying. I recommend this envelope to any business that needs a double window.