Last year I tried something new. I never do my inoculating in one batch and storing spawn can be tricky. If you leave it in the plastic bag it came in, it can get anaerobic and nasty if sealed too tight, and if not sealed tight it can become contaminated.
I like to transfer the spawn to a container with a hard bottom and sort of tall so I can make the most of it and fill up my inoculator easier. I found
these filters for wide mouth ball jars and they work perfectly. How perfect? A year later my spawn is clearly still viable!