Premium Headphone Case for Sony WH-XB900N Wireless Noise Canceling Extra Bass Headphones - Durable Protective Cover with Removable Cable/Amplifier Pouch, Elastic Secure Strap & Wrist Strap - Perfect for Travel, Gym & Daily Commute

This case has gotten me through some sketchy moments with my brand new $250 headphones intact. If you're gonna buy a pair of Sony headphones and you know they don't come with a hardcase, definitely grab one. This one is rigid enough. It won't withstand a lot of weight or force but you can be confident with this case being in your checked bag on a flight. (Even though you should really have your NC headphones with you on a flight)