I> l in haversack
In the haversack you see a deeply gouged mahogany crate and a corroded copper trunk.
I> rummage in haversack
You feel about a burlap haversack.

I think this was put in because rummage was originally more of an RP verb. However, I use rummage /b to look for boxes all the time. It really doesn't make sense to restrict this while invisible. Any chance this could get updated?