I like my Olfa mats. I store them flat on my sewing table. I have used my 24 X36 mat for many years. It is due to be replaced but I keep using it. I do use the lines for measuring and have never had a problem with accuracy. I had had another brand of mat (smaller) to use in the camper. However, it just wasn't satisfactory and I replaced it with Olfa. I like Jan's idea for storage- but flat also works.