We just took a small coolbox (5L I think) with us for our US road trip. Worth its weight in gold in the hotter areas. Plugged into the bike on the road and into power sockets in campsites and hotels. Having it as it came was ok for us but if you were going to build it into a pannier I suppose you could strip one down and use the working parts.
Battery packs for phone / camera etc charging work very well and I've got three or four of them now. Only one with jump leads though and when we needed it to start a flat battery car a couple of weeks ago it failed miserably. No idea why as it was fully charged but they're obviously not all equal.
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