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I discovered the TapIt Cap by dumb luck while looking for this fancy-schmancy metal growler that was rather expensive. If you added more than a few bucks to the already expensive metal growler you could get a pressurized growler which would keep your beer fresh longer. It's a good idea, one that TapIt Cap was able to do without the expensive growler part.
There are just two weeks left on this Kickstarter, which is about 90% funded. I don't have the excess cash to plop down for one of these, but I'll probably end up buying one when it becomes available commercially.