These are the capsules I buy (normally with 40mm rings) https://air-tites.com/collections/model-i-air-tite-coin-holders-with-black-rings
Then I get extra rings https://air-tites.com/collections/air-tite-foam-rings-only
OnFireGuy is also good, sell the same products, often in smaller batches https://www.onfireguy.com/
And of course you can find him on amazon and FeeBay. Just look for the onfireguy logo/watermark on the items.
Edit: These are the desiccant packs I use https://www.amazon.com/Pack-Indicating-Silica-Packets-Desiccants/dp/B01LZAQPEY?ref\_=ast\_sto\_dp&th=1