I store mine in a large air tight Ziplock tote with gasket and latches bought at Walmart couple years ago with descant packs in each bag also. check thickness with micrometer for correct dia due to humidity changes. also check for too dry/brittle so it dont snap while feeding when curved. if its brittle you may get somebody with a filastruder to recycle it if they know how to fix that issue. but long as it works its good. standard manufacture life states 2 years but thats not special storage care

Thank you n2ri you just answered a question I was going to ask. I had a half spool that broke into pieces on the spool and became unusable. Everyone talks about humidity being bad for it but this is the first time I heard anything about to dry. So I guess I dont need to worry to much about the desiccant in the bag. I have another spool that is starting to break at the end when I go to load it.

Time is your friend here.   Time at a low heat will drive the moisture out of the material.     Heating to a melt state will cause all kinds of bad ju-ju. 

If you have time,  check out Plastic Technology and their articles on industrial plastic drying.    That's what I specialized in for awhile.    Frankly a food dehydrator is perfect for casual 3D printing.

Novatech and Conair-Franklin are industrial drying machine companies the websites have a wealth of plastic drying info if you really want to get into the deep dark techno-jitsu.