There are also a few linked chests or barrels in the game, so you could do this without having to use the duplication trick.
connected containers?

There is also a weight bug that can be exploited to carry more than you should be able to, though it can be dangerous (destroy items).
weight bug and disappearing chests

Kiya's web site has changed, so any old links to 'kiya1.via.t-online.de' just need to have the 'via.t-online.' removed for them to work.

<img src="/ubbthreads/images/graemlins/kitty.gif" alt="" />