- large balloons (small ones don't work well)
- a funnel
- bowl to hold the flour
- scoop for the flour
Put some flour in the bowl.
Attach the balloon to the bottom of the funnel. Some funnels work better than others. Hold on to the balloon so that it doesn't come off.
Add flour to the funnel. Using the pencil stir the flour so that it will go into the balloon easier. (We did the first batch without the pencil and it took a lot longer.)
When the balloon is filled with flour, carefully remove it from the funnel and tie the end.
Wash off the balloon and dry it. There you have it - your own stress balloon.