Recently there was a thread discussing whether or not an iPad Air in a smart case would fit in the iPad Air Cache, and I think some folks suggested it would work (maybe I misread that).
For the record, I ordered one and tried it. For me it didn't work. At all. I asked TB customer service and they said…
"The Caches are designed to fit the exact specs of the device, so it will be extremely tight with the smart cover attached. The regular iPad Cache is slightly larger, so it could work."
I'm going to order the regular iPad Cache. If anyone is interested I can let you know if it fits.