A Cattex 70 starts at a diameter of 32cm (50 cm wide when flat) and has a burst diameter of 255-260cm (based off of Aphinity's videos), so it expands a bit over 810%. The latex round Garrett is holding up is 160cm wide when flat so we get a starting diameter of 102cm--and a burst diameter in the neighborhood of 8.3m. That's going to be dangerous when it lets go, so motorcycle leathers, a helmet, and really good earplugs are a must.

I know, I know, that neck on the balloon needs to be longer. I'll fix that if I do the animated sequence.

Artwork, Garrett © of me

Huh, Garrett looks surprisingly good in leather.