Not your typical Electrical Engineering post I'm sure but there is so much misinformation out there and I'm sure there would be some interesting applications for others here. I'd like to be able to charge not only my current laptop (standard Gigabyte 15 inch) and phone (HTC Desire) but future ones as well while backpacking, so obviously size is of the upmost importance. Hopefully something around 1-2kg and maybe 0.001m^3. I would hope for maybe 2-5 extra charges on the laptop and phone. This might be completely unrealistic. The standard laptop is 19V, the standard phone is 5V. It's about 1-1.5Ah for a phone, about 6-8Ah for the laptop. Laptop I imagine would charge with a general power outlet (I'm in Australia, but hopefully the principles or recommended product would apply) and the phone could be as well at seperate times, or even better would be a USB charger on the side. I'm not opposed to using solar technology either, or a combination of solar and rechargable batteries. Any ideas for optimising cost, size, durability, ability to charge 19VDC and 5VDC, take an Australian power plug and possibly USB?