Well,
I'll start with a winter hike/snowshoe day pack.

Randall #15 single hilt in a Combat Master Sheath.
SOG Tool Clip (The original one).
No fire arm ... I don't own a handgun at the moment.
Bear Spray ( They may be hibernating, and they may not!).
First aid Kit.
TP and small plastic spade.
Red Bird strike anywhere matches in brass waterproof container
which also has a compass. (Didn't I buy this from someone
on the Forums?.
Compass & map.
Whistle.
Flashlight (Maglite type) & headlamp.
Gerber StrikeForce fire steel. Tinder.
Small Flares.
Duct Tape. (sometimes wrapped around water bottle to save space.
Water in pack bladder and extra Nalgene bottle with water.
Plastic sheeting, folded.
Parachute Cord or heavier line, carabiners.

Oh yeah ... FOOD! MAYBE a small backpcking stove if I have room.
Candy to keep the energy levels up ... granola/protein bars.
A SALAMI SANDWICH!!!