My girlfriend is obsessed with preserving food (she's a recipe developer and master food preserver), so our apartment is already packed to the brim with fruit and vegetable filled Ball mason jars. But perhaps I could add a jar of my own to our ever growing collection, a Kerr canning jar converted into a battery powered amplifier and speaker, handmade in Sunnyvale, California! Hook a mobile device and press play as a speaker, or plug-in a guitar to use it as a miniature amp at the flick of a switch. In either case, you'll be...umm...jamming.
(Image: Uncommon Goods)