These are coin capsules. I (and other people) have been using them almost from the start. They protect the tokens from wear, and give them much more heft and bulk. i find they add to the experience, but keep in mind they take more room in your chaos bag!

As the last couple campaings they have started adding new kind of tokens (blessings, curses, snow...) I needed to buy additional capsoles, then I found this box that came with 100 capsules and went ahead and bought it.

If you are interested keep in mind a few things:

1) It's important that all capsules are the same, to avoid you telling them apart when sticking your hand in the chaos bag. Remember what brand you are buying and keep to it.

2) The minimum size is 25mm, but I recommend at least 26 mm. 25 fit too closely and, if you need to change the capsule for whatever reason, you'll need to destroy it to recover the token. 26 mm is loser. The ones in the pic came with the box, and are actually a little bigger, however they came with an adapting/padding system to make them fit snuggly (and nor rattle inside the capsule). It's the white ring that you can see around the tokens in the pic.

The ones I bought are very similar to this: https://www.amazon.com/-/es/PUXING-0-709-0-827-0-984-1-063/dp/B08LNJ6GHB/ref=sr_1_48?__mk_es_US=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=IB0WFO2C2PJU&keywords=coin+capsule&qid=1649786699&sprefix=coin+capsule%2Caps%2C177&sr=8-48