In reply to Gabe Oliver:
My set up for charging two DSLRs/GoPro/phone/laptop on multi-week trips is probably overkill for your needs but maybe it will give you some ideas:
2 x Goal Zero Nomad 27W solar panel
2 x Goal Zero Sherpa 50 battery pack
2 x UniPal Plus Universal Battery Chargers (it will literally charge almost all batteries on the market)
1 x 12V male to USB/micro USB adapter
3 x 3.5mm jack to 12v adapter (which plugs in to the 12v male/USB adapter, third one acts as a spare)
Relevant charging cables - you can also shorten/resolder your charging cables if needing to save weight
The Nomad 20 is probably a good option for your needs. I've heard the stating charging times with the Freeloaders cannot be trusted... All I can really say is you won't regret buying a panel that has a wider surface area/more power as you'll shorten your charging times.