Water is a big key to survival, so water purification tabs and some collapsible cups although I personally have 1 gallon zip loc bags packaged instead.
Shelter. I have 4 space blankets as well as a heavier duty disposable poncho. Getting drenched followed by a 20 - 30 degree temp drop is not pleasant.
2 100 foot rolls or paracord
A big KA Bar survival knife, a small hatchet and a machete.
A magnesium firestarter and striker I also have a couple forever matches and a small bottle of lighter fluid for refilling
Firestarter I make mine from dryer lint and wax but you can buy premade.
Needles and thread ,my thread is a spool of braid fishing line, small pack of #6 Hooks
dozen packs of alcohol prep pads (can double as a fire starter sometimes)
Small pack of sulfa powder
pack of benadryl
Bar of soap mostly for wound cleaning
a couple dozen sugar packs and salt packs real sugar here, can be used as a wound dressing, but is a great pick me up if you need some quick energy.
Survival manual unless you spent time reading and studying but its still nice to have
Guide to edible plants and berries for your geographic location.
Roll or three of toilet paper
roll of vet wrap or similar self adhesive bandage
pack of 25 .410 shells #6, dozen or so slugs for same, box of 100 .22 shells
my savage 42 O/U .410/22 I also have a snake charmer .410 only but feel the O/U is more realistic for survival
I made my carrying case from a length of 3" PVC with screw caps on both ends. Knife, machete and Hatchet are attached to tube whole thing is attached to a web Suspender part of the alice system