IF.... ." Don't just keep monofilament line, it goes bad from old age." WHAT kind of line can you store that does not go bad from old age A LITTLE RESEARCH Nylon monofilament is the ideal material for fishing line. It's rot-proof, totally resistance to saltwater, and sinks slowly. Monofilament fishing line does have two great weaknesses: Extreme heat and UV rays. Mono absorbs water and will become limper as it soaks. Maybe hot water does it faster; I've never tried. Sunlight and high temperatures can dramatically weaken these line monofilament has an average shelf life of two to three years, while fluorocarbon lines can last up to seven or eight years without losing its edge. These are under ideal conditions, however. One of the problems with mono is that it absorbs water and loses strength, which is why it overtests straight out of the box monofilament strength isn't affected by severe cold I think braid would probably last forever; My gut instinct is that properly stored braid on it's original spool would outlast mono. I'm kinda old fashioned when it comes to lines, still mostly use mono, but I think longevity is probably a "chalk on up" for the braid category. For flouro and nylon mono installed on a reel, it might eventually take a set (coiling) and present manageability issues before it actually became brittle or otherwise lost enough line strength to matter. Regarding shelf-life on line still on a bulk spool, I think with proper storage it will last a long time. I have been buying 1-pound spools (up to 8,000 yards a spool) of YZ and it will take me a number of years to use it up - I have no concerns about shelf-life at all. If you’re a fan of braid, you should be good to go. Braided line, when treated properly, can be used in the water for years. One simple idea is to store line away from the rest of your fishing gear in a more temperate part of the home. We may have been onto something when we alluded to refrigerating produce; you can do the same with your fishing line! It sounds like a joke, but refrigeration protects lines from both heat and humidity. fieldandstream.com ...Rather than let your investments roast on a garage shelf, or sit in a cabinet in your dank basement, store them in your freezer. Over time, exposure to moisture, sunlight, and seasonal temperature swings can degrade monofilament and fluorocarbon. The cold, dark, humidity-free environment where your Hot Pockets and fish fillets live, on the other hand, provides a stable, dry climate that can keep a spool of line—or fly tippet— fresh indefinitely. Keep it out of the light and in a cool dark place and mono will last a few years, but the line will curl for a while. Braid may last a very long time stored this way It’s easy to diagnose overexposure to sunlight, at least on monofilament lines. Even on “clear” variations of this line, you’ll be able to spot faded patches where UV rays have sunbleached the line. Inspect the monofilament for signs of age before winding it on a fishing reel. Kept in darkness and at moderate temperatures, line should keep its strength for several years. White powder coating the surface signals old and weak line. Line that is milky white instead of translucent is past its prime and breaks easily. Tie a strand to something solid and give it a hard pull for additional proof. 2015 shelf life of braid and mono 2015 I have several spools of andy pink from over 20 yrs ago . I don't fish fresh water much anymore by do occasionally. Those spools are still great. I kept them in the garage but out or the sun. 2015 I have a couple made in "west germany" from the 80's. 2015 I keep all my line in my heated garage a giant Rubbermaid tote. There's probably 40 or 50 spools of line in there. Honestly, I can't remember how old some of it is. The vast majority of it is as good as the day I bought it but there's a spool or two of Pink Ande that hasn't aged well. That line doesn't appear to have lost any of its strength but it has gained a very springy quality. It's like handling a kid's Slinky. I'd guess it's at least 20 years old and I won't use it to spool an entire reel but I'll use it for backing and for some of my short leaders. Guess I'm just too cheap not to get aome utility out of my purchases. 2015 I keep my mono in a dark cellar. Some from the 80's. Still good as long as it doesn't dry out from sunlight or heat. Jack Bogrand on Nylon becomes brittle with age due to “drying out.” In fact, nylon parts we used in a manufacturing process could be rejuvenated by placing in boiling water or simply storing in a plastic bag with a little water added to the bag. If your line has not been damaged by ultraviolet rays (too much sunshine) you can rejuvenate nylon monofilamint by putting it in boiling water (right on the spool) for a few minutes. You can verify this by pulling the old dry line to see how much it stretches before it breaks. After boiling you will find a certain amount of elasticity and a lot of strength has been gained. I don’t think this will work with fluorocarbon line. Does anyone soak their mono line in hot water to avoid line twist? Does this harm the mono? I know it makes it limp as a noodle and easy to spool. i was instructed to do this by a rep from Stren Co. hot tap water. another thing was to spool up from larger diameter bulk spools rather than 1/4lb size, larger coils less loops. yes,I have done this for 33 years,it makes the line behave very nice. I do this as well. Only hot tap water. Mono absorbs water and will become limper as it soaks. Maybe hot water does it faster; I've never tried. If you use too hot of water or soak for too long it will become stiff. Some guys boil 300lb mono wrapped tightly against a pencil and then when it cools it becomes stiff and makes a decent lanyard. Soak it in fabric softener for 24 hours,works great.Also works great on your throw nets.Will make them limp as a noodle. Test your mono with an overhand knot snapped tight. If the knot breaks, throw it out, if it holds, it should be fine. Not sure how universal that method works but for >15# mono I was told it is a good indicator. An old timer who is no longer with us taught me that one An easy test for the mono, tie an overhand knot. Pull firmly on the line, if it breaks, throw the line away. This is a great test to do on line before you have a retail store spool a reel. It is surprising how often I have found bad line at retail stores. I have never had this test fail me on line over 6# test.