The files arew formatted as 20" x 30". Staple can pint that size for @$5.00. This is the same size as the sheets of foamcore carried by Walmart. While at Walmart5, you will want to pick up a glue stick. I prefer glue stick for this kind of application because it will not cause the paper to wrinkle like a white glue will. I use the larger Elmers gluestick. it's an inch in diameter and will cover faster.