If you find Helium to be a little too heavy, and hydrogen to be too risky, then go with a vacuum. Lighter than hydrogen without the explosive qualities.


If you can't find really pure vacuum, then you might just try regular space. NASA and the new Chinese rocketry program have started bringing back canisters of space from their orbitals for resale back here on Earth. Should be pretty cheap because there's not much production costs, just harvesting what's already out there.

...or not out there as it were..

A totally new meaning attached to the well known wife-directed expression " I need some space "

Good idea for a gimmick gift. Might make enough money to buy a kite or two! A can of "Space" that you can buy and give to the wife during stressful times...

Terrific idea! I want a percentage of your profits (for creating the mental connection between outer space and wife space). 10% is OK. Thanks!

Deal! If the idea ever blossoms into being, you can be the "Applications Visionary."