I use these envelopes to ship calendars and brochures to various agencies in town and they are sturdy enough to hold alot of material. Plus the self adhesive strips are so much better than licking glue!
This envelope is Okay but I don't care for the self seal. Unless I use tape it will open in the mail. The construction is also a little flimsey. When I use this to mail to clients I always have to use tape at both ends to ensure that it does not open when Postal office gets the package.