I use these envelopes frequently throughout the year for so many things. Paying bills of course storing coupons for the grocery store so that I can conveniently reach for them in my purse while shopping. I especially like that they are NOT transparent so I feel confident that my private information cannot be seen through the envelope. These envelopes are very sturdy and hold up throughout the riggers of mail processing with the Postal Service. I purchase a couple or three boxes a year.