Re: What does it run?
"Indeed, you could set up a small network of servers in your backpack."
When I was secretary of a local Unix users group, it was often my job to carry the proxy server and all the networking gear to and from the big regular meetings. I'd also be carrying my own desktop system. So that was two medium sized desktop boxen, one WiFi AP, two or three 24 way hubs / switches, a few hundred meters of network cable, one monitor, keyboard, mouse, power cables, and assorted power bricks. In my backpacks (one of those hybrid packs where the day pack can clip to the main pack, and bounce on your tummy as you walk), either walking for two hours, or on the bus.
And people kept wondering why I was always pushing to get the proxy server replaced by something physically smaller.
None of this was battery powered though.