If it's for storage and protection from dust and impact, you have to take into account that you can't put it inside the box right after use otherwise just a single drop of sweat can turn it into a Petri dish. At minimum the bacteria can multiply and you end up with a funky smelling headphone; leave it in that dark but now moist box interior long enough and it will be really rank, with fungi or mold growing. Dust is a far better alternative compared to that.
As for impact protection, as long as you keep the cables out of the way and whatever surface they'll be on is either dedicated just to the audio gear or at worst on the same table as your computer - which in either case you'd be careful with, and not one where you would haphazardly toss stuff onto or you have a bag on and swing around and drag something off it - I don't really see how it can just get knocked off the table.
Of course, what you can do is get a padded box, set it on the table with the top open and resting against the wall,and then just put the headphones in its slot after use. It can't easily get knocked over since it's basically like being in a trench, and then close it only after some time to let moisture evaporate first. Or not close it at all, anyways dust is something you can clean off with a small cloth and a hand vacuum, compared to mold that at minimum would waste the earpads. AFAIK AKG sells those asymmetrical earpads for $45 each.