What are some small, pocketable/keychainable items that are worth carrying everywhere you go?

LucasWaffyWaf@lemmy.world to Asklemmy@lemmy.ml – 203 points –
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"Tape measure"

I measured my fists. Does well enough.

And know the sizes of some common items; paper currency, coins, hand, arm, length of stride. You can use these to get a close approximation.

My hand span is exactly 7", and my thumb knuckles are exactly 1" long, with the nailbed exactly halfway back.