He keeps a jack and spare tire in the 'trunk'.
a 'trunk' full of clothes
the 'trunk' of an artery
(..) some crisps. Do you want anything? It's OK, I know you don't. Well, actually, maybe I'll... I know you don't. Sherlock? Hmm? This envelope that was in her trunk, there's another one. What? On our doorstep. Found it today. Yes, and look at that. Look at that, exactly the same seal. (..)2012 TvShow: Sherlock Title: The Reichenbach Fall Season: 2 Episode 3