I take my salt and use old glass tomato sauce jars with the lids that have the built in gasket. I put the salt in that and screw the lid on tight and it’s hermetically sealed.
No moisture in or out and it’s never caked on me.
Also, it’s a product you don’t see listed much on prepper articles but salt is critical for survival and in a SHTF, zombie apocalypse scenario, could literally be a life saver.
Excellent tip!