Review on MBC MAT BOARD CENTER Polypropylene by James Jenkins

I use these to protect handmade greeting cards until I am ready to ship them. Many of my postcards are 5" x 7" and when I add a lot of embellishments or card layers, they barely fit in a 5" x 7" envelope pocket. They're big enough that I can even lay out the cards and see the greeting inside. As long as they seal well, I can find other uses for them as well. Since they are acid free, I can also use them for photos.