Best Fly Line Backing: The Insurance Under Your Fly Line
Updated How we research
Backing spends most of its life doing nothing, then decides everything the day a strong fish empties your fly line. It also fills the spool so your line sits on a larger arbor and picks up faster. The choice is between dacron, which is cheap, easy to knot, and standard for trout, and gel-spun polyethylene, which packs far more capacity and strength at the same diameter but costs more and demands care with knots and fingers. We weighed strength ratings, diameter and resulting reel capacity, knot behavior, color options for tracking a running fish, and rot resistance. Twenty-pound dacron covers nearly all freshwater fishing and most anglers should not overthink it. Thirty-pound dacron or gel-spun suits saltwater, spey setups, and small reels that need more capacity than their size suggests. Replace backing when it fades and feels fuzzy, not after a decade of guessing.
The short version
We compared 7 picks. Our scores range from 7.6 to 9.2 out of 10.
- Best overall:RIO Products Dacron Fly Line Backing High-Strength Braided Line 20lb/30lb Multiple Colors and Lengths. Highest overall score in this guide at 9.2/10.
- Also great value:Scientific Anglers Fly Line Backing Dacron 20 lb Test White 150 yds. Value score of 9/10, overall 8.6/10.
- Solid build:Cortland Gel Spun Fly Line Backing 300 Yards 30 LB White. Build and materials score of 9/10, overall 8.8/10.
- Feature-rich:Maxcatch Braided Fly Line Backing 20lb 100yds Orange with Tapered Leader 9ft 5X 6pcs. Features score of 9/10, overall 8.6/10.
Scores are our editorial assessment, not customer ratings. How we score
RIO Products Dacron Fly Line Backing High-Strength Braided Line 20lb/30lb Multiple Colors and Lengths
RIO Products Dacron braided backing in 20lb/30lb with multiple colors and lengths, a dependable backing for any reel size.
Our score9.2/10Budget
Cortland Gel Spun Fly Line Backing 300 Yards 30 LB White
Cortland gel spun 300 Yards 30 LB white backing, a thin, strong backing for saltwater reels and long running fish.
Our score8.8/10Budget
#1RIO Products Dacron braided backing in 20lb/30lb with multiple colors and lengths, a dependable backing for any reel size.
Fit for the job 10/10 · Features and specs 9/10 · Build and materials 9/10 · Value 8/10
- + 20lb/30lb options cover trout reels through saltwater setups
- + Multiple colors and lengths let you match reel capacity easily
- + Dacron is easy to knot and has low stretch for backing use
- - Dacron takes up more spool space than gel spun backing
- - Right length must be chosen to avoid overfilling the reel
#2Cortland gel spun 300 Yards 30 LB white backing, a thin, strong backing for saltwater reels and long running fish.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 9/10 · Value 8/10
- + Gel spun has a thin diameter so more backing fits on the reel
- + 300 Yards of 30 LB backing suits saltwater and big game rods
- + White color is easy to mark and spot on the spool
- - Gel spun needs special knots to prevent slipping
- - Thin line can cut into itself if not wound on tightly
#3Scientific Anglers Dacron 20 lb test white backing, 150 yds, a standard trout and bass reel backing.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 9/10
- + 20 lb test is the standard backing strength for trout reels
- + 150 yds provides plenty to fill most freshwater reels
- + White color makes it easy to see and mark with line codes
- - Not strong enough for big saltwater species that need heavier backing
- - White backing can show stains and dirt over time
#4Maxcatch 20lb 100yds orange braided backing with 6pcs 9ft 5X tapered leaders, a combined rigging bundle for trout reels.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 7/10 · Value 9/10
- + Includes 6pcs 9ft 5X leaders so the whole reel can be rigged at once
- + Orange color is highly visible when a fish takes you into the backing
- + 20lb 100yds backing suits typical trout reels
- - Bundle adds leaders you may not need if you already have a supply
- - Bright orange is less subtle for anglers preferring neutral colors
#5Cortland Micron fly line backing, a classic braided backing that many anglers have used for decades.
Fit for the job 9/10 · Features and specs 6/10 · Build and materials 8/10 · Value 8/10
- + Micron is a well-known braided backing with smooth handling
- + Low stretch keeps a solid connection when fish run
- + Knots bed down cleanly for secure backing-to-line connections
- - Check the backing strength and length before choosing a spool
- - Takes more space than gel spun for large saltwater reels
#6Aventik Dacron braided 20LB 100 Yard blue backing for trout, a colorful budget backing for freshwater reels.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 9/10
- + Blue color helps spot the backing clearly when a fish runs
- + 20LB Dacron is a good trout backing strength
- + 100 Yard spool fits most freshwater reel capacities
- - Not enough length or strength for saltwater reels
- - Colored dye may fade after heavy sun exposure
#7Maxcatch braided backing in 20/30lb, 100yards, a budget backing for anglers setting up new reels.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 9/10
- + 20/30lb options let you choose for trout or bigger fish
- + 100yards is enough for most trout and bass reels
- + Maxcatch price keeps rigging costs low for new setups
- - 100yards may be short for large saltwater reels
- - Budget braid can fray sooner than premium Dacron
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- Dacron takes up more spool space than gel spun backing (RIO Products Dacron Fly Line Backing...)
- Gel spun needs special knots to prevent slipping (Cortland Gel Spun Fly Line Backing 300 Yards...)
- Not strong enough for big saltwater species that need heavier backing (Scientific Anglers Fly Line Backing Dacron 20...)
- Bundle adds leaders you may not need if you already have a supply (Maxcatch Braided Fly Line Backing 20lb 100yds...)
- Check the backing strength and length before choosing a spool (Cortland Micron Fly Line Backing)
- Not enough length or strength for saltwater reels (Aventik Dacron Braided Fly Line Backing for...)
Frequently asked questions
›What is the best choice among fly line backing: the insurance under your fly line?
RIO Products Dacron Fly Line Backing High-Strength Braided Line 20lb/30lb Multiple Colors and Lengths is our top overall pick. RIO Products Dacron braided backing in 20lb/30lb with multiple colors and lengths, a dependable backing for any reel size. It earns our score of 9.2/10, based on fit for the job, features, build and value.
›What is a good budget option?
Cortland Gel Spun Fly Line Backing 300 Yards 30 LB White is the strongest low-cost pick in this guide. Cortland gel spun 300 Yards 30 LB white backing, a thin, strong backing for saltwater reels and long running fish.
›How much should I expect to spend?
Picks in this guide span $ price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Fly Fish Nest independently selects every product; we may earn a commission from links above.
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