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max_trax posted on r/trailrunning1w
Not sure if it will get small enough for you (I think it will... I'm 32-33" waist and still have plenty of adjustment left) UD Race Belt https://ultimatedirection.com/race-belt/ + the add-on front pocket https://a.co/d/0hd3nwcA. I modded the snap closure on the main pouch to use a loop of elastic cord with a toggle, rather than having to fiddle with a snap behind my back. Can also stretch it out to stuff a windshirt or similar light extra layer in there.