i can clear my 2 1/2" DIAMETER 4' LONG bong in one hit, but i cant fill and clear in one hit.

but i agree, frankly my 13" glass with dif and ashcatcher gets me jsut as high, and i can snap a larger amount in that than the 4 footer(and it takes less time). its also much more smooth.

its the idea of diminishing returns, size is good up to a point,30 someodd inches is the maximum practical length for a straight tube IMO, after that the advantage of a longer tube is pretty much negated. and after a certain point, it actually becomes detrimental! cause it can take sooooo long to draw smoke into he chamber, that it ends up getting stale.