Other than general stuff others will carry
Food, water, Map if needed, etc.

A metal cup that fits my water bottle.
A contractor trash bag or two. Can be used as a shelter, poncho, bath tub, etc. etc. as good as and more useful than a space blanket.
A means to start a fire and tinder of some sort.
SAK RuckSak model, Bigger blade and has a saw.
Water purification method, iodine.
Para Cord wrapped on my Wooden walking stick.
If I know I will be walking at night, a headlamp but as a spare
I have a couple photon lights on zippers.
Small 1st. aid kit.
Needle and thread, hooks, safety pins, Sp. Shot.
Duct tape.
Small compass.

This sounds like a lot of crap but really is not.
Other than water & cup it will all easily fit into a small belt bag
weighting less than one pound.
I do not count my knife, something sharp goes with me everywhere.

IMO the best deals going for all these items right now is a Doug Ritter
Pocket kit or the new version of SOL kit ( $25.00 +/-) and a AMK 1st. aid kit if you just want to buy and go.
No connection to either Company.