Look out everyone, we're having a BOYS vs GIRLS water fight with our own DIY Sponge Bombs! These water sponge bombs were really easy to make. In fact we made ours on location at the Salt River in Arizona. Instead of water balloons that break and leave a mess, our sponge bombs are washable and ready to use over and over. As you can see in the video, they're held together with just a pony tail holder and maintained their shape throughout the water fight. Furthermore, we made them from biodegradable sponges...should one get left behind.