Cut the sponges into fourths, which made it easier to make them all roughly the same size.
End up with 12 pieces for each sponge, which made them nice and full.
Stack up 12 pieces, pinched the center together and wrapped a rubber band as tightly as and get it around the middle.
Snip off the ends of your string and these bombs are ready for some water play
That's it, threw them all in a bucket of water in the yard and make fun.