I would take a hard milk bottle of infinite milk. (that i can throw at my enemies).

I would take a flying horse called Epona. (to fly over stuff) like a plane.

I would take a fantastically flushing toilet. (small in size, but powerful in strength) to flush my evil enemies down to the drain.

I would take a stubborn pencil case. (which gives me the opposite of what i ask) so i can ask for a broken sword so i get a new one.

I would take a gigantic gas mask (which has different air for different places) to protect me from the smell of toilets.