drwlf
500+ Head-Fier
That company makes an even larger case, same style, https://www.amazon.com/Headphone-Protection-Beyerdynamic-Sennheiser-Ballistic/dp/B00ENO322C/ref=pd_sim_107_4?_encoding=UTF8&psc=1&refRID=7NFY1V4F1NJ8VQRCFNY3
Why not the official HiFiMAN travel case?
It's cheaper, sturdy, and in my case, even fits the m9XX with the 'phones & cables whilst travelling. Just lovely.