If you had to run into the woods with 5 items and never come back, what would they be?
Here are my items:
#1 TRACKER KNIFE
It acts as a great survival knife. Its design makes it very versatile for survival.
#2 FRESNEL LENS (magnifying lens)
A lighter can start hundreds of fires. A fire starter can start thousands of fires, but a fresnel lens can start fires indefinitely. It can't light fires at night or when it's cloudy, so for that reason, I don't recommend it for cloudy and dark places. However, I was thinking when 10 years has passed and your fire starter is no longer working, you will be wishing you packed a fresnel lens instead. If you get a fresnel lens that is big enough, assuming you can carry it with you, you can also cook food with it without leaving a smoke trail, melt and shape metals, and warm rocks to keep you warm at night--all great advantages of a fresnel lens over a regular fire starting item. Magnifying glasses and solar fire starters are nice too, but I think they are easier to break.
#3 GI CANTEEN KIT
A canteen kit gives you the ability to purify water and cook food. It's a nice combination of a water bottle, pot, and stove that packs up nicely.
#4 SURVIVAL SEEDS
It's amazing that so many people don't have seeds in their long term bug out bag or survival supplies. You need seeds. They result in easy food. Don't rely on hunting, fishing, trapping, foraging. Farming is much easier. If you have seeds with you, you've taken a major step in the direction of good survival odds.
A military sleep system is a really good option for staying warm and dry. It has 3 different layers to suit many needs. If you are going to be in a really cold place, you should spend more and get a sub zero capable sleeping bag/bivvy.