You know, the Goal Zero Yeti 1250 battery pack with 60w solar panel isn't a bad idea, but it takes over 2 days to recharge from zero in direct sunlight. But if you combined that with a Morphon 400w wind turbine (which can dump 1.4 kw of power over a windy day) you'd be right set for running your portable electronics all day, every day assuming you had some combination of sun and wind . . .
Yeah, it's a couple thousand dollar investment and not single-man portable but for a long term base camp (Boy Scout Summer camp?) you'd have a single simple solution to keep the power going!