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.

And of course, this is where belt drive are going to be beneficial, on a commute/utility bike with internal gear hubs;

http://farm4.static.flickr.com/3416/3553872870_65a18809f9_b.jpg

As for the Fixie Inc one, I have a closer look at it and notice the hubs look like a standard flip flop hubs, which mean the belt cog can be screw onto any normal track hubs, if that is the case, then it'd make it so much easier and simplier;

http://farm4.static.flickr.com/3547/3524112395_8aef2c66d1_o.jpg