There is so much difference of opinions on this topic, but I have found that Eden LOVES a locking lid sealed glass jar. They have them at grocery stores, IKEA, or on Amazon. I close the lid on my starter after every feeding. I don’t do cloth or pop the lid, ever. I feel like this allows the gasses to build better, keep out unwanted pests (like fruit flies), and helps mold spores from getting in. If you’re worried about your jar breaking from pressure, you can always remove the seal so gasses can escape but still have the benefits of the closed lid. And then if you ever need to stick her in the fridge, you can put the seal back on to prevent mold and ensure it’s sealed tight.