More power to you and your gadgets
The good: I normally wouldn't care what a battery looks like, but this one is space-age gorgeous, and its slick aluminum body, measuring 4.3 by 3.1 by .08 inches, slides easily into a carry-on pocket. The real plus is that it packs a punch. This backup battery can power up my iPad to at least 60 percent of capacity - and sometimes a bit more. For phones or MP3s, you would have a seemingly bottomless pit of power.
The bad: The Giant itself takes a while to charge fully; it seemed to average about 12 hours for me with a wall charger, not included.
$39.95 from jackeryusa.com or amazon.com.