MT Products White Flat Shipping Envelopes 11" x 13.5" - Self-Seal Mailing Envelopes (Pack of 15) - Made in the USA

I use these to mail my etsy art and they are perfect. Sturdy and keep contents safe! I do include a "do not bend" sticker but I have not had any issues with it bending! Good size too, I can fit a cardboard page protector, cellophane page protector, 1-6 pictures, several cards, and stickers all in one package. I use it to mail 8.5x11 inch pages, but you can fit 9x12 pictures in them too.

Worked great for selling and shipping my paintings. (9x12in watercolor paper)

I used to buy similar envelopes from Uline, but no longer need large quantities. It's great to buy great quality envelopes in such small quantities via Amazon with Prime 2-day delivery, to boot. Life is good!

I usually don't mail print, so this was the first time for me to use these. I'm very pleased. They were very sturdy & I have no doubt that my prints were very protected. They were exactly as described and I would buy them again.

It was the perfect size to fit 8 x 10 pictures and gives sturdy protection to mail.

I ship paintings and order these mailers every time I run out! Super sturdy and have not ran into any issues while shipping. I also protect my paintings with a plastic sleeve inside the mailer.

It's hard to get excited about a mailing envelope, but these were exactly what I wanted. My goals was to ship certificates that would arrive undamaged and unfolded. That's how it turned out. This product is well made. You can buy it with confidence.

I needed something to mail some photos in that the post office would not bend and this worked perfectly. Less expensive than the ones the USPS sells and very sturdy with good adhesion.

These mailers are clean, sturdy and reliable. Excellent quality and perfect for mailing art prints and other documents.