Hey, I'm not sure whether this is a serious post or not, but rubber bands are a very bad way to store cards. (Although a quick Google search for "lobster claw bands" will find you what you're looking for.)
I recommend instead using card storage boxes like this one (and available in a ton of different sizes) that can store hundreds or thousands of cards without bending or damaging them.
If you're interested, I can also help you make sure individual cards and small sets are properly protected, but given your question, it sounds like you're more interested in making sure your full collection stays together instead.
Like These?
I personally would not sell anything yet. I understand it's a lot and you feel like the market is going to dry up: I can assure you the market is not going to dry up. The cards you have, if you have the ones you are mentioning in other comments, will always be valuable. I suggest you start saving money and having these cards graded via SGC. I would recommend PSA and BGS for price and re-sell, but SGC is very well known for older/vintage cards and PSA /BGS are currently not accepting submissions.
With old cards people are looking for authenticity, rarity, and condition in that order. A PSA 1 Mickey Mantle will still sell for thousands of dollars.
People are going to be messaging you left and right about this, do not sell anything. Take your time and go through it all.
Buy penny sleeves, toploaders (very hard to get right now), some of these depending on how much you have, these for grading submission, etc.
Sorry, I don't really understand the question. I'm wondering about the Cardboard Gold brand. Example:
Dude I went thru this same problem and bought a bunch of different boxes. Now these are all I use for graded slabs and top loaded cards.
BCW 1-BX-GTCB Graded Trading Card Box https://www.amazon.com/dp/B002JS3R9M/ref=cm_sw_r_cp_api_glt_fabc_3JC52V5X9296MNA1WBK7?_encoding=UTF8&psc=1
I got it from Amazon. I plan on buying another one next week as I'm working on a deck idea :). Here is the link if anyone is interested: https://www.amazon.com/Mystery-Pack-Limited-Collectible-Stickers/dp/B07TDD13BM/ref=sr_1_1?dchild=1&keywords=rare+frens&qid=1600836037&sr=8-1 I think you can also buy on Ebay but I'm not sure.