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My cameras and lenses are supposedly water resistant, but I always take AquaTech rain covers like pic related. ThinkTank also make good ones I've heard.
I also always keep the lens hoods on the lenses, as it's usually the front of the lens that takes knocks against brush and trees, the hood softens the impact a bit. A UV filter will of course save your front lens element from scratches.
If I'm not going out with the express intention of taking photos, then I'll just take a bridge camera like another anon suggested, and plastic bag to keep it in.
