This speaker is small enough to be portable, but it may be better off kept out of an overloaded gear bag. Instead of metal, plastic, or wood, the Mason Jar Speaker and Amplifier uses a glass canning jar enclosure. The battery-operated speaker components are in the “lid” and just screw down onto the jar. You’ll need to plug your audio source in – there’s no fancy Bluetooth or AirPlay with this speaker. It apparently comes with its own Mason jar, and the assembly is 3.5″ in diameter and 5″ tall. It’s $65 at Uncommon Goods.
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