If you're doing the smaller ziplock bag, here's the recipe:
Put 2 tablespoons of baking soda in a small torn of square of a napkin. Fold the napkin into a little packet. In your ziplock bag add 1/2 cup of water and 1/2 cup of vinegar. Go outside, put folded napkin inside bag and quickly close bag, you may need to give the bag a little shake. Then the bag will slowly start to fill up and after a few seconds should pop.
We got a bigger pop when we used a gallon size bag. The recipe for that size is:
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