I'm a packer and I save 5 gallons. Containers that I can clean well enough to reuse. I have 2 brands of seal buckets that are spotless and these lids don't fit either. The only buckets I could use them with were Black Jack elastomeric buckets. But even fitting them properly took a lot of hits with a rubber mallet and a block of wood. I'm glad I only bought 3. My next purchase will be from another seller who doesn't sell Asian knockoffs. A real feed bucket might work, but don't expect it to work well on every bucket.