Slater
Headphoneus Supremus
Looks a lot like the "Mini Monitor Vault" cases by Westone that were, if I'm not horribly wrong, produced by OtterBox. Great little cases and very sturdy. The only disadvantage was that the area around the clasp locks eventually started to form cracks due to the rubber gaskets wielding too much force on the clasp.
If you don't need the cases to be waterproof (who does?), then you could just remove the gasket. No gasket = no cracking = problem solved.