I can't speak to the color, but the V46 holds my XXL EXO900 scorpion helmet on its side, with room to spare for gloves and other misc gear (not enough to hold a jacket though). I had to experiment with a bunch of different monokey cases before I found one that would fit my helmet, as the monokey line tends to get wider and shallower as you go up in capacity. By contrast, some of the monolock cases are skinnier but taller and will accomodate a helmet standing up. They are also more affordable and smaller profile. See the recommended products for more details.

Depends on the size. I fit an XL Shoei Qwest with a Sena Bluetooth mounted on it in my V46 and I imagine you could fit up to a single XXL Multitech. They market it as a 2 helmet case but I've only been able to fit two helmets if they are L or smaller helmets; otherwise, it's a single helmet case.