Ahh, the perfect thread for me!
My favorites are the GL series balloons from Cattex, which are gigantic even when uninflated.
From left to right:
- Used clear GL1200
- Used heat stretched yellow GL700
- Used purple GL500
- Unused white GL1200
- Unused blue GL700
- Unused purple GL500
Plus a standard 12-inch ruler for scale. The used GL1200 is almost four feet long