Stash water-proof matches in every pocket of your clothes in a small ziplock bag, just a few in each. That way if you take off your pack and go off to "look over that next hill" and get lost you'll have some matches to start a fire.

Tape over the barrel of your gun. I always do that and it helps a lot!

Use several small bottles of water instead of 1 or 2 big ones. You can stash them in all the little pockets of your pack or pants or coat and you can drink a whole one each time you drink, instead of having a 1/2 empty quart bottle sloshing around while you walk.

Bring extra batteries for your GPS, Laser Rangefinder, Radio and wrap them in a ziplock back then in a solid 3 layers or so of duct tape. That way they don't short out on anything in your pack and are secure and not banging around.