While it won't keep you attached to a belay rope, the Nomad Clip will keep you within constant reach of a USB cord. Packed inside the polycarbonate and steel carabineer is a charge/sync cable available with either a micro-USB or lightning connector and a standard USB input. The d-shaped device is sturdy and secure, with a spring-loaded steel arms that makes it easy to attach to a bag or use it as a key ring and a rugged shell able to withstand the abuse of every day life. It's an incredibly clever way to keep a cord on you at all times and, best of all, means you'll never have to beg random strangers for a spare ever again. [$35; hellonomad.com]
It's an incredibly simple way to keep a cable within reach at all times.