The first bags I bought from Ebay were way too small, and thin, and while they did work, I didn't like them at all. Then I bought 60 of these from Amazon https://www.amazon.com/gp/product/B09TVZLM9Y which seem to be a lot better. I haven't used any of them though. I ended up going with quart jars. My next big shoebox grow (did 28 last time) I think I'll try the bags again. I can also fit more pounds of grain in my 23 quart PC using bags, than I can using jars. Also nothing to wash and store when I'm not using them.