As digital natives and frequent device users, the phone battery runs out quickly. So it's only logical that power banks are an essential piece of kit. The problem is that most power banks are either too bulky and heavy or light but don't store much energy. That's why people have been testing and testing down to the last 2mm until powerbank was as thin and compact as possible without compromising on performance. The (Re)Classic Power Bank is thinner than a centimetre, but powerful enough for a 100% full charge.