IT WOULD HAVE BEEN HELPFUL IF THE INNER SIZE OF THE MAILERS WAS DETAILED ON THE PACKAGE. I HAD PURCHASED THE 8.5 INCH BUBBLE MAILERS TO MAIL BOOKS THAT WERE 8" X 8" and only discovered they were too small when I opened the package to see if the book would fit. It didn't.
I mail prints of pastel paintings that I create to friends. These envelopes are perfect and the prints arrive in excellent condition ready for framing.
I use this mailing packet to send small gifts that will not fall apart or break in transit because of the lined bubble wrap. The price was also a terrific incentive.
10.5"W x 15"L is a good size for mailing certificates and files. A good addition would be matching size optional lite weight rigid inserts to protect from being bent.