Ideal for traveling, portable and very small. However, for everyday use at home, I fill it up 2-3 times. But that's not his goal. It's easy to use and one of the things I like is the quick turn on and off by just pressing the power button. Instead of holding it for 2 seconds. This is important because when your mouth is full of water it's nice to touch the button once and turn it off if you want, rather than spilling it or stopping, rinsing and turning it back on.
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