Vorbeck Materials announced the Vor-Power straps, a graphene-based light-weight flexible power source that can be attached to any existing bag strap to enable a mobile charging station (via 2 USB and one micro USB ports).

The Vor-Power strap weighs 450 grams and provides 7,200 mAh. It can be pre-ordered for $89.99 (normal price is $129.99), and this is one of the world's first graphene product, and probably the world's first graphene-enabled battery:

http://www.graphene-info.com/vorbeck-materials-launch-graphene-based-flexible-battery-strap