Alternative energy gadgets: No battery, no cry

Ah, the sun. Here at Crave we don't see it too often -- the price of being based in South London. But when it does creep from behind the clouds, we like to harness it to our will, perhaps with the Voltaic Systems Converter. This £100 solar-panelled rucksack is an ecological double-whammy: not only does it charge your gizmos, it's made from recycled polyethylene terephthalate -- that's the PET stuff that plastic bottles are made of.