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In a nutshell:
Old air bubbles had "fat gas" in them, which was made of particles that were too large to escape through the plastic of the air-bubble, thus ensuring that the air-bubble would not deflate with time. (to counteract the shrivelled-balloon effect)
But, fat gas was deemed bad for the environment, so now they had to find a way to counteract the shrivelled-balloon effect without using fat gas. So they fill the bubbles with "clean air"but clean air would escape through the plastic (small particles) so they basically thickend the plastic they make the air-bubbles with so the clean air couldn't escape. And thicker plastic means the bubbles are smaller.
You had me until the last sentence... why does thicker plastic mean smaller air bubbles?