The bags have a battery built in, along with a complete charging system: Apple connector, Micro- and Mini-USB connectors and an on-board USB port for charging up to 4 devices at once.

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John Kestner and David Carr created Twine, a 2.5 inch-square device with on-board temperature and vibration sensors, as well as an expansion connector for other sensors, such as moisture sensors and magnetic switches, all tightly integrated through WiFi with a cloud-based service.

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