The Package
Mionix ships the Castor in a nicely folded box.
The bundle is pretty small. You only get the mouse, a set of stickers, and a quick start guide for those who don't know how mice work.
Mionix is sticking with their braid-sleeved cable, which is admittedly one of the best of its sort on the market, but still worse than an all-plastic one in terms of friction on soft mats.