S.A. Dacron Backing 20 lb x 5000 yd Blue is the steadfast foundation every serious angler relies on when a trophy fish makes a blistering run. Built by Scientific Anglers, this 20-pound test backing threads cleanly onto your reel with a remarkably thin diameter, delivering dependable performance when every cast counts and the fight intensifies.

Key advantages you’ll feel on the water:

• Thin diameter, low friction – At 0.018 inches (0.46 mm) for the 20 lb version, this backing minimizes bulk on the reel spool, helping you achieve smoother retrieves and quicker line pickup as the fish surges.
• High abrasion resistance – Engineered to stand up to rough cover, rocks, and saltwater structure, so your backing won’t give way during long, hard runs.
• Colorfast and highly visible – The blue backing stays true under pressure while remaining easy to monitor during a fight, letting you manage line length and tension with confidence.
• Generous yardage – A full 5000 yards on the bulk spool minimizes re-spooling interruptions during extended sessions or when chasing species that demand long, controlled drifts and deep retrieves.
• Trusted, proven performance – Designed by Scientific Anglers for durability, consistency, and reliability across freshwater and saltwater conditions.

Practical use cases include blue-ribbon encounters with big steelhead, bonefish flats challenges, and other demanding games where you need a backing that won’t compromise your tackle. This backing pairs seamlessly with standard fly lines, providing a solid, predictable anchor for long casts and powerful hookups.

Why travelers and trophy hunters alike choose this backing: it combines a compact profile with bite‑back strength, so you can focus on the bite and the drag without worrying about backing failure. When up against serious drag, you want a backing you can trust to stay intact, spool after spool, season after season.

Tip from the field: when spooling, maintain consistent tension and avoid overfilling the reel to preserve the backing’s smooth integration with your fly line. With 5000 yards available, you’ll appreciate fewer stops for reloading during those epic days on the water.