Exactly what I was looking for to mail pictures. Very sturdy.Mailed a puzzle to my sisterI use these to ship 11x14 photos.While these were a little pricey for what we needed, they were also much easier than trying to make storage envelopes for large prints and posters from leftover corrugated boxes. I would have been happy to purchase them in singles or two-packs, but the extras will come in handy later, I'm sure. :)Shipping matted 16x20 photograph. Added mat board to stiffen. Disappointed in thickness.I bought these to ship artwork, but they really aren't rigid at all. They're easily bendable. In order to use them, I had to insert layers of more rigid material, and I'm just keeping my fingers crossed that the work will arrive cross-country undamaged.These are 1/8” short of stated dimensions which doesn’t seem like much. But we ordered them to mail calendar gifts which are 12 3/8” wide. So the missing 1/8” meant the calendars were a tight fit, ripping wrapping paper in a couple cases. Other than that very good quality.These were perfect for shipping my poster size photos.Buen gramaje del cartón. Útiles traslado de fotografías.Exactly as advertisedCertainly a great, high quality product.