200 Pack 5x7 Corrugated Cardboard Sheets for Mailers, Flat Packaging Inserts for Shipping, Mailing, Arts and Crafts Supplies, Dividers, DIY Projects, 2mm Thickness

Perfect thickness for my postcard shipping needs.

They came warped and not flat. Extremely thin. No protection what so ever.

Durable and easy to assemble

True to size and great for packaging items or putting backing in a frame

I used these for my business and mail stickers in between. Since I started using these, I havent had any issues with mail bending. These are thicker than I thought!

I think most people mistakenly think the thicker the cardboard, the sturdier it is. However, these inserts are thin yet much sturdier than the thicker board I previously used. Ive purchased them three times now and all have been in great condition. As far as size, they measure exactly 5x7.

You get a lot for your money. Perfect to use with mailing.

A little pricy but seem to be of good quality. They are pretty thin but seem surprisingly stiff considering their thickness. They are also quite smooth. I purchased these for use as stiffeners in padded mailing bags for use in shipping small items. They might be a little smaller than ideal for use in a 6x9 inch mailer but I think theyll probably work out for that OK. These would probably work nicely for a lot of arts and crafts projects too. They measure exactly 5x7 inches and 0.079 to 0.080 inches thick. I hope this info is helpful.

I needed this to protect some prints that were 5x7 inches, but the cardboard, while sturdy & decent quality, isnt exactly 5x7. They are slightly smaller in both width & height, so doesnt work for my purpose. Really annoyed.

I ship out trading cards, and I use these in the envelope, so the card doesn’t bend. These things are VERY stiff, and work amazingly well.