Firstly my mini caddy from papermania has a full set of promarkers (with their end dots on) and 6x letraset metallic markers and several duplicates I have in my main used colours. In total 183 pens in that mini caddy plus a bag of promarker fine tips.
And also my collection of all the currently released flex markers - stored in 2x Letraset wallets.
I store all my pens flat but the mini caddy is upright only when I am using the pens. So there you have the main implements in my colouring obsession.