The "Waterbuoy" is a compact keychain that, upon submersion in water, coughs up a plastic orange balloon capable of keeping up to 1 kilogram at the surface for up to a day. An LED flasher makes the Waterbuoy visible even at night.
It's £15 on Firebox UK. I hope I'm not the only one who thinks clipping a couple dozen of these to my clothing and jumping in the ocean would be really awesome, at least until the displacement of the balloons made it impossible for me to raise my head out of the water.
Catalog Page [Firebox.com via Coolest-Gadgets]
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