They put their thumb on the scale. Purchased  the 5 x 8 anx it is 4'9" x 7"8 5". Shorted me 3 inches one side snd 3 1/2 the other.  More deviation than you expect accidently, and it is not that cheap. 

Also,  would look better binded, which it is not.
 Cokor are very pretty, and will be a hassle to return...so need to think on it.