The sizes of vary by manufacturer. They are approximately 9 to 13 inches long by 9 to 12 inches wide when opened up. When closed, they are approximately 3 to 5 inches wide. When purchasing towels for a dispenser, measure the dimensions of the dispenser to determine what size to order. Although C-fold and multi-fold paper towels look similar, they differ in the way they are folded. A c-fold paper towel is folded in the shape of a C, most noticeable when the towel is completely unfolded. C-fold paper towels are not interlocked, but instead they simply lie on top of each other. A multifold paper towel has a Z type fold to it.