Advertised to convert any 5 gallon round pail into airtight storage. Well, my new 5 gallon bucket from Lowe's and one from Tractor Supply shouldn't be round because the lids don't fit on the bucket. I had to use a ratchet and it took a lot of effort to get the ring in place. I then tried unscrewing the lid, but the lid wouldn't snap into place, let alone screw me back on. The pressure required to attach the ring deformed the bucket so much that it could not accommodate the lid.