MyCharge Peak 6000
The last thing you need during a trip is for your phone or tablet to run out of juice. The MyCharge Peak 6000 is a portable power supply with built-in connectors for the most common gear—and a USB port for the less-common stuff.
The half-pound Peak packs enough mobile power to charge not only small devices like phones and Bluetooth headsets, but also larger tablets like the iPad. I've been using one for months, and it has quickly become my most indispensable travel accessory. Read my original review if you want to learn more.
The Peak 6000 lists for $99.99, but AT&T currently has it on sale for $69 shipped.