WHAT—

https://www.adafruit.com/product/4373#tutorials

(Edited to replace kickstarter link because KS owner is a evangelical self-defense missionary person and creeped me out: this version goes to the infinitely less-dodgy Adafruit.)

Tactical Multi-Tool Hairpin / Hair Clip

Trends come and go, but preparedness is always in fashion! Have you ever been in a situation where you desperately needed a screwdriver right away? Now you can have one at-the-ready all ...

@cstross
So this is part of the US (And to a smaller extent, Global ) EDC thing where there's a certian subset of people who assume tha thtey're goignt o have to murder quite a lot of people gratuitously every time they get out of thier giant SUV to pick up thier starbucks.
They're obsessed with carrying multiple flashlights and knives to the point of self parody.
@Cuprohastes I carry insane flashlights, but then, I'm night blind in one eye and street lighting is often inadequate for me. Knives, not so much (it being thoroughly illegal hereabouts)!
@cstross
That said, I own a ton of the little nulon zipper poiches: they hold lens cleaners, bandaids, pens, small notebooks, antacids, insane flashlights brighter than the sun, USB cables, gum, and paracord (in case my shoelace snaps or my belt fails etc.)
They're genuinely useful ways to keep small items from rattling around.