For those who simply can't bear to go a day without their gadgets, notebook-sized solar panels can provide a solution. One guy even brought his laptop and phone to the top of Mount Everest, which really seems like a bit of overkill. Isn't the top of a mountain one place where you could probably do without a phone? In more mundane uses, regular backpackers and cyclists can attach them to their packs or bikes so they can have enough juice to fuel one more gadget fix. The systems are quite frequently homebuilt but a few companies do offer ready made systems, which of course cost about twice as much.