

Rather than dangle the helmet from your bag or backpack as seems to be the most common option, the Stashkit helmet folds into a flattened U shape in order to make it more packable. The Stashkit helmet conforms to European CEN safety standards but there is no mention of CPSC, Snell or ASTM certification which are the ones that enable the sale of helmets here.
Available in the UK here.
-via Oh Gizmo