I have read in a few places that a photographer knows what he will need to bring. I know you guys will probably give me tons of crap for this one but I am stumped because what if something comes up and you need that lens or something special that you don't have. Wouldn't it be better to go by the 'ol boyscout motto "always be prepared"? For example, if I'm out looking for moose or something and only decided to bring a small zoom lens but the moose is 200' away and the lens won't zoom quite enough to get a good shot. I think I would rather carry the extra lens than miss out on a good shot. I understand that "you'll know the more you shoot" idea but it just doesn't make sense to me.