Freeze water balloons before your next outdoor adventure. Fill them up with water (of course) and place them in the freezer overnight. They’ll make round “ice cubes” that fit neatly in between drinks, sandwiches, and anything else you want to place in your cooler. You can even line the bottom and top of the cooler with them for extra coolness.
After you enjoy the ice-cold drinks and sandwiches you brought along for your outdoor adventure, and the icy cold frozen water balloons begin to melt, you can use them in a balloon toss or to play water balloon ultimate frisbee.