Why can't I hold all these dragonbones?

Dragonbones change from a desirable commodity to a heavy waste of space. They sell well, but by the time you realise that you have too many of them, you have a full set of dragon/daedric armor and don't really need money anymore.

Skyrim's future will be paved on dragonbones and iron knives, mostly because there's so many of them.