Do Funnels Take Up More Space Than They Should?

A funnel is difficult to store, whether you put it in a drawer or hang it on a wall. It seems to take up way more space than it should. Nothing else stacks or packs well with it, not even other funnels of the same size. A funnel is an odd shape, and it is difficult to estimate visually how much space it needs. Why is that? It seems somehow related to its function.