If you do plan to store it for years, I don't see a problem with keeping the made up cassettes in the little plastic cans. Place the cans in a bag with silica gel packets like Andy K suggests, and you r film will be fine.
But why bother going through all these gyrations anyway? Just how long will these 18 or so rolls of film last you? Unless ambient conditions are truly bad, age fog is simply not a problem unless you plan to keep the stuff long term - really long term - like years.
I buy lots of bulk film, and have at least 8 loaders with various kinds of B&W film sitting on the top shelf of a basement closet. Some of the stuff is outdated by a couple of years and has been in the closet at least 1 whole year. It's still fine, and I know this because I used a roll of vintage TMY just the other day. Granted, because the closet is in the basement, the temperature does not get too warm in summer, though it will reach about 80 deg. F for a few weeks each summer. Bulk rolls waiting to go into a loader are kept refrigerated, but once they are queued up to go, they stay at room temperature.
Don't worry about it.