being a keen survival enthusiast, and very new to geocaching i pretty much take the same stuff as if i was going foraging or just walking the dogs,
knife (fixed blade or lock)
survival tin (not a lot i can't do with it)
water bottle or flask depending on the weather
mobile phone (n95) with viewranger maps on it
and i obviously dress to suit the climate
BUT when i go out with the wife and kids THATS A WHOLE NEW BALL GAME
a 90ltr bergan would just about hold the kit i have to take then