You can keep a box of baking soda in the gun cabinet to absorb moisture that could rust your guns or knives.
You can dip your fishing lures in baking soda before using them to keep your human smell off of lures so that the fish will be attracted to your lure.
Keep a box of baking soda with you when you are camping to put out camp fires in the woods safely.
Use a sprinkle of baking soda in the boat to absorb moisture in the bottom and to prevent mold or mildew from growing when the boat is not in use.
After using your sprayer to water plants you can add a little baking soda to the container before putting it away this will keep mildew and fungus to a minimum making it easier to get ready to use next time.