Thought I’d pass along this inexpensive find for blanket tags: Zip ties with a roughly quarter-sized tab that you write on with a Sharpie. Several colors so you can color-code to a specific horse or a specific blanket size or liner weight, etc. I wanted something a bit subtler than cattle ear tags, and quieter and cheaper than metal dog tags, and these are just the ticket.
AMPCOM Nylon Cable Zip Ties with Marker, Self-Locking Written-on Cable Mark Ties 4.72 in - 5 Colors/ 100PCS https://www.amazon.com/dp/B07DW8BS4J/ref=cm_sw_r_cp_api_glt_i_BANP943NYFJ1RP6706GX?_encoding=UTF8&psc=1