As he listened to it, Keeton felt his mind begin to drift away like a child's helium-filled balloon.

How many regular-sized helium-filled balloons would it take to lift someone?

Yes, the helium-filled balloon does lose lifting capacity when it shrinks.

A helium-filled balloon stretched over a framework, I imagine.

Georgie's pills were making me feel like a giant helium-filled balloon, but I was wide awake.

Would have prohibited the release of 25 or more helium-filled balloons at a time.

It touched the ground as lightly as a helium-filled balloon.

Inside, there were plants sporting red good luck ribbons and more helium-filled balloons.

The Caltech group used an instrument carried by a helium-filled balloon.

Don't expect to get very far though; the helium-filled balloon remains firmly tethered to the ground.