What do YOU consider "essential gear" on a photo shoot?

I'll be honest, most of the time, I'm shooting it's usually a pretty "run and gun" affair while out interacting with the public.  People generally refer to that as "street shooting", but I think of it as "impromtu portraiture".  Either way, I'm generally working alone in situations like that, so the idea of working with assistants is pretty alien to me.  Still, I have to admit I'd really love to assist...
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