Great idea in theory, but they're heavy when wet and insanely painful when hit. I really wanted a fun, more eco-friendly alternative to water balloons, but it's not. My kids range in age from 9 to 15 and they all throw too much (even when trying to restrain themselves and not hurt people!) to make them a viable choice. We haven't tried them on a trampoline. Maybe they aren't painful if kids just jump around with them instead of throwing them at each other (although what kid wouldn't even throw them on a trampoline?).
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