Not nearly as good as a toothbrush, but better than nothing

I like to leave these in my backpack for "emergency" tooth brushing, but they're not nearly as good as a toothbrush. On one hand, the product has a place (a bad toothbrush is much better than nothing!), but on the other hand, I wonder if there is an intelligent way for me to figure out how to bring a real toothbrush and toothpaste in a way where nothing will leak out. (I suspect that there is a way!)

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