my small daily carry has bandaids in a few sizes, a small compression bandage and gauze, alcohol wipes, tweezers and gloves, a compressed rag, and then like over the counters like antihistamines, antiemetics, topical anaesthetic etc etc
for the specific context of a rally that could turn nasty, your starting point would be something like tourniquets in a couple sizes, gauze and compression bandages, in a couple sizes, gloves, tweezers, alcohol wipes and field scissors. maybe regular bandaids, panadol, butterfly stitches.
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