I bought one and it's under the sink in the bathroom. I think it's a fantastic idea. It does drain very easily (see the video on the website). BobS is right though, you do need ~1/2 hour to fill it.
Great idea. For $30, buy a couple and you really shouldn't have to worry about draining and repacking. If water service is down for more than a few weeks, there will be nothing to refill it with anyway.
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