Belt drive fixed

Question, when flipped, does the belt detachable? How will the belt be tight enough for it? Or do you need to carry around with you another size belt?
I know this is an old post, but was wondering about it the other day.

It would work in the same way as a standard chain and a fliflop hub. As long as the room for adjustment in the drop-out/track-end, is enough to compensate for the difference in cog size there would be no problem.

Personaly, I'd advise the use of chain tensioners. The belt drive is more sensitive to tension differences than a chain.