When posting a package does the cost refer to the size or the wieght of the object?

planning on sending a large package but not heavyWhen posting a package does the cost refer to the size or the wieght of the object?
it refers to both , for more info check the royal mail website - www.royalmail.co.ukWhen posting a package does the cost refer to the size or the wieght of the object?
Both but mostly the weight! x


Lacey
Yes to both
Both