This is a marvelous idea! Using them for a hot air balloon project like this is a good way to advertise doing something constructive with them instead of just throwing them away or allowing them to blow freely all over the place making a mess.

As a child, my grandmother raised me and she did not drive so we always either walked a mile one way or rode the city bus to the grocery store downtown in Des Moines IA. She sewed her own canvas shopping bags to make it easier to carry more food at one time - brown paper sacks had a tendency to break while being carried the long journey home. We each carried two filled with groceries.

Recently, our local Houston TX grocery stores starting offering canvas bags for sale with their store name and logo. I bought two and I was amazed at how much will go in those two bags and still not be too heavy for me to carry across the apt complex from the parking lot. Then I noticed Wal-Mart has done so as well so I bought one of theirs too.

I hope more people will use canvas grocery bags and that eventually those plastic ones will not be manufactured any more so they cannot be used in a project like this balloon.

I would be a little reluctant to go for a ride. :)

lol ... I hadn't considered that ... I don't think I would want to go for the first few test flights ... but after it was flying without falling apart ... I probably would then :)

As an arts & crafts project, I find it to be a marvel .. I wonder how they made it? I cannot even imagine a way to do it.