Rice Balloons

In an attempt to create this:

I created this:

So, exactly how do you get that much rice/oatmeal/playdough into the balloon without blowing it up? We enjoyed them anyway. If I figure out the right way, I might try making them again. Otherwise, I do know how to make water balloons.

Yes, he did bust the red one by sitting on it and rice went everywhere. Hence, why I made it an outside activity.