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My 5-year-old adopted one of these as a pet. She buckled it into the car, shared her snacks, and gave it a name. Unfortunately, these don't last long at all. We only inflated one at a time. Within two days, all four were popped. When they're inflated, there are noticeable areas that are kind of bulging and weaker than the rest of the balloon. We've played with a lot of mylar balloons over the years. They usually last weeks or months. None have popped as easily as these. If you inflate these and they are left alone as decoration, they will probably last a while. The won't last if they are played with.