I wouldn't purchase the one at Walmart either, if they have any left. You can't use the backside. Better to use the 50% or 40% off coupons at Michaels or JoAnne Fabrics for the very same item. I have 2 Olfa Brand 18"X24" rotary cutting mats, both purchased with coupons. You can put them together side by side or end to end to really measure and cut out larger projects. Still use my smaller 12" X 18" Duraheal Brand for smaller projects like cutting out small squares or creating potholder hot pads. Will be sewing today, its too hot to go outside. from, Debbie, Phoenix, AZ