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segler said..
Even plastic zippers corrode or fill up with salt and stop working. If possible, I always opt for cord. Sailworks switched from zipper to cord years ago. My mast bags are all velcro, but velcro gets full of weeds and stuff.
Actually, it is quite impossible for plastic zips to corrode.
But yes, they can still get jammed up with sand or mud,, although I live in a very sany place and don't have an issue with it and zips.
And yes. Velcro has it's own issues, especially around weedy lakes and seedy or cut grass.
Even simple draw chords can have issues, but at least they can almost always very easily be just replaced with another bit of chord. Plastic chord spring stoppers are notoriously fragile but can be replaced for a few cents and one can even tie a slip knot.
Zips: Pretty well all zips teeth these days are some form of plastic and are usually very durable. Its the metal sliders that are the problem. If you are going to use fully plastic zips on sports goods, they are best to be large teeth and sliders, which may not be so good for fashion items, but are perfectly good for sports goods.
But zip sliders can be had in stainless steel as well. I have them on (plastic teeth) zips on a couple of my board bags used for travelling. No signs of deterioration now after 7 years of use.
Zips, and sliders can be replaced as well. Sliders can often just be threaded on the existing, perfectly good teeth.
My local upholster has replaced zips or sliders in quite a few windsurfing and surfboard bags for me over the years, and it is always a LOT cheaper, and far better for the environment, than binning them and buying a new one.
I have seen some poorer quality plastic sliders as well as many excellent ones. The sub standard ones are usually to small (fine) for the job. Plastic zips need to be larger for the same strength.