Rescue a Balloon with a Helium Transfusion

Step 4 Recycle the Sacrificial Balloon

You can use the tube to suck the rest of the helium out of the sacrificial balloon(s), returning them to something resembling their initial uninflated state. If there's substantial helium left, amuse your friends and family by talking with a lung full of helium, and remember to occasionally get your lungs full of regular oxygen-containing air as well.

Once the balloon is fully deflated, it can be stored easily and saved for future occasions. It's probably not economical to rent your own helium tank to re-inflate old balloons, but once you've collected a whole bunch you can consider doing things like inflating them with regular air and filling your house/office/whatever-mates room with them :-)

You can also use this technique for deflating "collectable" balloons to save them (like those nice expensive balloons from Disneyland), and eventually for saving your favorite party balloon.