To be honest there are a lot of reviews saying they don't work or aren't worth your money. I bought them with the expectation that some of them would burst. I mean how much do you fill them up without this simple tweak? 20 or less popped or deflated when the party actually took place after about 30 minutes but I actually give it 5 stars because I'd rather pay for it taking me less than a minute to fill 100 water balloons anyway and 20 lose than spend hours filling 100 water balloons that mostly pop and splatter everywhere while I tie them anyway. Would definitely recommend if you have better things to do than fill a million water balloons. I don't recommend it if you're worried about having exactly what you have in your pocket. But what's so interesting about that? :)
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