When i saw these, i though they might be useful, but the 10 dollar price tag turned me off.
Here's how to make your own from thing lying around the house.
You can even throw in something extra!
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Signing UpStep 1What You Need
A film canister
A paper towel
Scissors
Water
A piece of glass Tupperware
Your hands
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http://www.instructables.com/id/convert-a-tire-inflator-type-air-compressor-into-a/
http://www.survivalsolutions.com/store/product350.html
http://www.thinkgeek.com/gadgets/travelpower/add9/
Even if you don't,
-Cheers, Chris