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"Now, by all indication this Zuca bag is build tough as nails and is durable as hell. On top of that, there doesn't seem to be enough design difference between the $300 Pro model and the <$150 Sport line. For the extra they are charging their biz travellers that they are targeting, I personally feel they should offer a lifetime warranty if this is the market they are shooting for."

I totally agree re the warranty. But the two bags aren't comparable--you have to buy the cubes with the sport, they come with the pro. But, with the sport you get two sets of really cool wheels.....