Matches - strike anywhere type with the heads dipped in wax. Add in a small square of sandpaper.
A sterilizing tablet - the ones they use for baby bottles are fine, and one of those will final clean 10 gallons of water without tasting too terrible.
A 40 denier nylon woman’s knee sock - makes a good filter and folds up really small.
Two aspirin - very effective painkillers.
An unlubricated condom - they are surprisingly good as emergency water carriers.
A strip of magnesium ribbon - for starting fires no matter how wet the wood is.
Those, plus the fishhooks, monofilament, needle and thread and a scalpel blade are what is carried in the handle of my survival knife, but could easily be fitted in a wallet.
I have a dupe set of that in a small tin (Altoids tin) which moves from coat pocket to coat pocket as the seasons change.
Thanks! Great suggestions.
I already carry a Heart Attack First Aid Kit in my wallet. You never know when someone around you is gonna keel over.
It contains 4 adult, 325 mg, aspirins and a 100 mg. Viagra tab. The aspirin thins your blood and the Viagra opens up the blood vessels in the heart to let blood flow more freely.
Don’t laugh. Viagra was originally created as a heart med and is still used as such. The cool side effects were an unexpected bonus.