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I use one of these (Power Bank) it can charge phone 3 times give or take and is pretty handy.
The bigger the capacity the better though so Ed's looks good, what's it like with cold?
I'm yet to use mine in anything too low so not sure how it will hold up!
Mule 
@edscoble
If you're mainly camping (camp site), the majority of them offer power as an option, sometime it's much quicker to charge the external battery in one hours than several hours using the solar panel.
A massive battery says 10,000+mAh would be a better option, can easily make your phone last a week from a single charge (iPhone usually have 1900mAh to give you an idea).
I ordered an EasyAcc battery (12,000mAh) for my tour soon, someone on here used one and was happy with it.