Rigid Mailer .037" thick Natural Kraft Chipboard.19-1/8 x 26" inside. Mails 18 x 24" prints and mats.

Reliable and well-made

I like these rigid mailers for sending artwork--you need to add some more support inside to keep them absolutely rigid when they are this large, but they are extremely useful. I also use them to carry artwork around the city and deliver in good shape.