small lights in big modifiers

A video from my buddy Will Crockett about using smaller equipment so that he can travel lighter.

This may not interest you if you only use Speedlights, as I do, but it got me to thinking about something. I certainly understand the desire to travel light as I work by myself. I also like round light sources like Will. I have been known to use Brolly's because they are round and so the shape of the speedlight head is not as much of an issue. What I was wondering was what is the largest brolly available? The Wescott Orb? Anyone know?  Plus the external battery issue for speedlights is still puzzling me, my Canon battery pack is not all that reliable but on the other hand I don't to burn my speedlight up either.