Filter I bought doesn't fit in mason jar. What happens if I have my cold brew exposed to air?

Shouldn’t be a problem while brewing. I’d just drape a towel over the top while it brews to prevent anything from getting into it.

We use a toddy system at work to make cold brew, and the lid has a bunch of holes in it, presumably to minimize condensation from doing a hot start. Just seal it up once you remove the grounds and it’s ready to drink.

Hello fellow northeasterner!