Do you label your fly lines, reels, extra spools? How?

Protecting Your Fly Fishing Reel - 2 Guys and A River

The Fly Shop's Signature Fresh H2O Fly Rod/Reel/Line Outfits

How To Setup A Fly Fishing Rod For Beginners - The Fly Crate

Keeping a few spare large arbor spools handy makes changing lines on the fly a snap.

Clearwater® Large-Arbor Extra Fly Spool

DI-Fly: How (and Why) to Spool a Fly Reel

Fly Fishing Knots

Got my first legit fly reel and tried spooling it myself. Did I do alright? : r/flyfishing

Do you label your fly lines, reels, extra spools? How?

Fly line identification whilst loaded on reel