Their does not seem to be a way to perform a lookup that provides for returning the nest higher value (in the table). Any example would be an array (table) of box sizes arranged from smallest volume to largest with a part number next to each (as the output of the lookup). Now you would do a vlookup (or whatever) for a given size or volume. The vlookup returns either an exact or one smaller - obviously you can not put more into a lesser box - so why can't it select the next value Greater than the input value rather than equal to or less than....