I mail Stampin’ Up! 12″ x 12″ Designer Series Paper in these great rigid mailers. If you need to do the same, I highly recommend these on Amazon. Right now, there is a coupon for $9.77 off!
Their official name is Quality Park 12-3/4 x 15 Photo Document Mailer with Peel and Seal Self Seal Closure, Extra Rigid 26 Pt White Fiberboard, 25 per Box. I have bought them a few times. Keep going back to the same seller. Hope this tip helps!
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