I couldn't find the precise dimensions of the remote, but the water bottle comparison in the description of the Mavic makes this
Maxpedition Bottle Holder look like a pretty cool choice -- throw in a little foam as a separator and it looks like you could fit extra batteries, the remote, and the Mavic in here:
This
Condor H20 Pouch is very similar in design and half the price (about $16), but it doesn't look as "solid" so it might protect the Mavic a bit less:
(Note if you buy one of these, I suggest buying from Amazon vs. a third-party reseller, as you'll be assured you'll get the real thing and not a counterfeit.)
If anyone picks one of these up, let me know what you think. I'm considering ordering the black Maxpedition bag, as it almost looks like it was designed for the Mavic. I've got a little eggshell foam in the garage I could use as a separator -- put the batteries and maybe charger in the bottom, foam, then the Mavic, and put the remote in the outer compartment.