So, some nice folks in France have sort of achieved the Better Mousetrap of cycling: a folding helmet. It doesn't pack down as tiny as, say, the Hövding, a collar-mounted inflatable 'airbag' helmet. But, to be honest, even having seen all the crash test footage, I'm not sure I would totally trust the Hövding. Plus, this foldable number looks pretty cool.
Scratch that. Really cool.
What also interests me is that in both cases, one of the first things people note as an advantage is the bike share scenario. People using bike share programs don't necessarily plan ahead for it, or want to carry helmets around with them. Hell, I don't particularly enjoy it: finding a place at the restaurant to discreetly stash my helmet (and gloves, and removable headlights); clipping the chin strap to the back of my backpack and having it bounce about back there; dropping the helmet in my shopping basket and then having to stack my groceries in around it. No, it's not a massive problem, but it's an inconvenience. This helmet actually packs down small enough that if I put it in my bag, there would also be room for, gasp, other things. Want one.