You don't need a desicant, it's not humidity in the roll that is the
concern, it's humidity outside.  Here is how it works:

Warm air, say at 20C/b8F holds much more moisture then air at 0C/32F,
so when you take a cold roll out of the freezer, it causes the air
close to it to get quickly colder, that causes moisture in that air,
which cam no longer hold as much moisture, to condense, usually onto
the surface that is colder.    If that surface is something like a
car, or grass, you get dew, if it's cold enough, that dew can freeze,
giving you frost.

If the "dew" forms inside the film canister which is open to the
outside, it will codense on the film, which is not good, it causes the
film layers to stick together.  If it is inside a plastic film can,
like with purchased film, then the moisture condenses on the outside
of the plastic can or the box, which is no problem.

So, drop by a local lab, and pick up 20 or so extra plastic cans, so
you have one can per completed roll.   Then condensation should not be
a problem.  Another thing to do, is pick up a few of those plastic
kitchen containers, before you freeze the can with the bulk film
loaded, put each can into a plastic kitchen container, get the clear
ones, so you can read the labels, and drop those into the deep freeze,
put on the date you froze it,  so that you know, that the clock was
stopped on the expiry.......

Yes, you can refreeze film that has been thawed.....

W

Freezing bulk loaded film shouldn't cause any more problem than either
freezing the bulk room itself, or freezing commercially loaded film.

However, if you want Tech Pan or Pan F, you'd best get what you'll want
now -- both are being discontinued, it seems, and sooner rather than later.

I'm doing it for at least 10 years now, and never had a problem. Take
care to freeze them in ziplock bags to avoid condensation on the film
itself.

G.
Gilbert
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I've had no problems with simply putting them in sealed plastic bags and
freezing them.