I do as Playfelt does and make the bubbles for the children to chase. When they are 3 and older I let them hold the bubbles and learn to blow them because they are usually old enough not to spill them all the time. I mean bubbles don't cost that much, but when you take out 5 little bottles and they are all dumped you are watching your pennies wash away. Last summer I bought a hand held battery powered bubble maker with a button to push that makes tons of bubbles and the children LOVE it!