Magic the Gathering Cubelet is a format similar to MTG Battle box. It’s a (roughly) 100 card, shared library, shared graveyard, no lands format for 2-4 players.
I’ve been looking for small cubes or boxes that I can carry with me at any times and while Battle box is fun, it’s bit too large to always have with me. Right now I’m looking into building a Cubelet since that fits into a commander deck box and those always fit in with me.
The website has a list of existing cubelets designed by different people. I’m initially interested in building either RedShirtDown’s One-Drop Cubelet or Learn to play Magic Cubelet.