Rain gear is on the list, but I would like to make a point that for our trips you need to bring "quality raingear."  We go late season and can get days of steady rain, drizzle or freezing rain.  Cheap raingear won't do.  It should have some cloth inner lining so it doesn't rip apart on a branch or when stressed, and it should be dense enough like goretex so you have difficulty shucking air through it; otherwise it can become saturated and soak thru and that's when you have potential for hypothermia.

Rule #__ Bring "Quality" (non-cheap) Raingear