I'm no expert, but... No, I'm no expert. I am part of a Facebook group though, I'm part of a lot of Facebook groups, I'm a little obsessed, but this Facebook group in particular is a group for sourdough bakers. A post went up yesterday asking about the proper way to store sourdough. Most commenters were using a Kilner style clip top jar, which was no surprise, I use one myself. What did surprise me, shocked me to my core in fact, was that almost all of my brethren were advocating the removal of the seal from their clip top jars. I really, really don't think you need to do this, and I'd like to explain why I think this is the case.