Even in this day and age of doing everything online you just still need an old-fashioned envelope. Because some of our friends and family do not have computers we still need to send documents through the mail. These envelopes are sturdy and convenient to use and accommodate most of our mailings. 500 sounds like a lot but it's always nice to have them on hand for an emergency.
So far each envelope has had a small remnant of the gummed area that hangs and then falls off as it is dampened. But I realize that they were tge most economical choice and they serve my purpose.