When I started collecting, I quickly outgrew both the 48.6 cup Komax and the 74 qt Iris containers. I would recommend future-proofing your tupperdor by going as large as you can. If you have a Costco membership, this Coleman cooler works great as a coolerdor (it's what I use).
You will need 2 x 320g 62% boveda packs if the cooler is 70%+ full but you can get away with 1 x 320g boveda pack until then. I just set a subscribe and save on Amazon to send me 2 packs every 3 months as a reminder to switch out the packs.
Finally, I use this wifi-enabled hygrometer and thermometer to monitor the internal humidity and temp. I set alerts when temperatures and humidity hits a certain threshold and I receive the alerts on my phone as a notification.
I'd be concerned with humidity building up in closed/sealed containers--especially if they are outside. Then you get mold and rot. This happened to some really lovely clothes I had years ago.
Consider something like this as a bit of insurance: https://www.amazon.com/dp/B01MT9SR1C/ref=emc_b_5_t
So get a 320g. :)
Boveda 62% RH 2-Way Humidity Control | Size 320 1-Count https://smile.amazon.com/dp/B01MT9SR1C/ref=cm_sw_r_cp_api_glt_fabc_GCSM8Y889YJJ9JWEMQDY