What is the best way to stack two five gallon buckets like this

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United Solutions 5-Gallon (s) Food-grade Plastic General Bucket in the Buckets department at

BUILT TOUGH - Made with durable thick plastic to resist cracks, this large pail is designed to get the job done for housework, yardwork and the back

United Solutions 5 Gallon Bucket, Heavy Duty Plastic Bucket, Comfortable Handle, Easy to Clean, Perfect for on The Job, Home Improvement, or Household