http://www.diylife.com/2007/07/09/diy-tennis-balls-little-yellow-useful/

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8. Secret storage – Looking for a place to stash that million dollar microchip while you’re at the gym? Slit a tennis ball and stick it inside! Works for anything that’s valuable (or not) and small enough to stick inside a tennis ball via a tiny slit.

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Interesting for putting your BOB kit in?

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