I keep my bum wad in my unheated mudroom and never had a problem.

You can make an inexpensive desiccant with rice inside a wrecked or spare sock, used dryer sheet, or old cut-up holey shirt if you want to go that route. Depending on your humidity it might not be a bad idea, but I would think the bag is more important.

The plastic is possibly to keep little silverfish bugs out for long term storage, or dust. If it's tied or taped right, it may also be there to protect against leaks or flooding - a lot of storage totes and buckets that have been opened and closed multiple times aren't overly watertight.

I keep my big paper stores outdoors in a similar manner, because if they're watertight, they're fine. Temperature isn't an issue for anything but the glue bindings on books. Extreme heat and repeated heat-freeze cycles can break down those bindings. I wrecked several paperbacks in my truck in MD and in AZ learning that lesson. 🙁 Nothing else is susceptible in the paper world, though.

The humidity in a bathroom following a shower is more intense than any humidity that you will find in an unheated garage in a Canadian winter. If anything, you should be adding diaper rash cream to deal with dehydrated cheeks after using the outhouse at -40C.

On the more serious side, I agree with the previous posters. Don't worry about humidity. Worry about dust, bugs, and floods attacking your important papers. And those dastardly bum wad scrunchers that overuse their daily allotment.

Sounds good. So begins the experiment.

Bugs and mice probably are the biggest problem. Floodwise, it turns out I'm on the high ground.

I like to store my crap wrap by taking out the cardboard rolls. It folds easier that way. In fact, I carry a roll like that in a sandwich zip lock bag in my backpack when I'm hunting or fishing just in case.
I'm certain it would be easier to pack in the rubbermaid if done like that.

I like to store my crap wrap by taking out the cardboard rolls. It folds easier that way. In fact, I carry a roll like that in a sandwich zip lock bag in my backpack when I'm hunting or fishing just in case.
I'm certain it would be easier to pack in the rubbermaid if done like that.

That's a good point actually. As it stands, I've found a 68L Rubbermaid holds 33 double rolls (with the cardboard roll intact). 2 Glad "contractor" bags, half each. I've packed 2 containers with plans for a 3rd.

I have toilet paper, p. towels and p.dishes stored in rubbermaid type tubs, in a shed for about 2 years now. All left in the original pkging. No problem at all with moisture or mice.