I'm still confused about this also. I've read different forums, and snus websites, and people mostly keep it in the fridge if they are going to use it within a few months. And people freeze it in vaccum sealed freezer bags to store it for a year or more. But then some people freeze everything no matter what, and some people I read on a forum never freeze anything, just use the refrigerator, with no problems. On a snus seller website it was recommended to freeze it if you were not going to use it before a month, but to use refrigeration only if you were going to use it sooner.
I am still new to this stuff, too, so I don;t know. It seems freezing does work the best if you have a lot of cans. I've only been keeping them in vaccum sealed bags in the fridge, except for the 5 cans I have open at one time, and I keep those in regular ziploc bags. I use a cheap ziploc vaccum seal system from Walmart. I've also tried putting a silica filled humidifying baggy, soaked in distilled water, meant for cigars and to keep loose
tobacco moist, in the ziploc bags with the open tins, to maybe add more humidity to those bags, but I don;t know if I really need to. (The humidifying baggies cost fifty cents at the
tobacco store.)
So far, I only use snus I buy locally, so I only have maybe 10 cans in the fridge and plan to use them the next couple months. Then I open them based on the expiration date, using those already "expired" first, then the ones with later best before dates later. I've read that the "best before" dates are really just a suggestion, and that they are fine for months after that date, even up to a year if it's been kept in the cold (and of course much longer if frozen properly). I did get 3 cans General loose a couple weeks ago, that had a best-before date that was 3 months past, and it was like a moist hockey puck, but it still tasted ok. I think they were a little less moist than a fresher can of loose.
Lately, I keep one can with the portions I am using for the next couple days (I put about 4 varieties of portions in a can, with a homemade divider in the can. i fashioned the divider using gorilla tape
! ), and I don;t even keep the can I am using in the fridge at all, to save the trouble. That seems to be working ok. If you have a can opened after it's been in the fridge, it's supposed to last a week or two outside of the fridge at room temperature, as long as you are going to use it. Heat is bad for it though, I read that you should keep an un-refrigerated can away from direct sunlight or from a hot car, or even your pocket for extended periods. I also have a can of loose I am using regularly at home, that I decided to just keep out of the refridgerator.
I hope more experts post their experiences on this subject!