Our 4 gallon pails stack and palletize efficiently. These are space-saving pails and they stack easily for secure storage. When you are done, you can nest the empty pails for efficient storage. Some of our square pails are FDA compliant, and some come with a metal handle. Cover is sold separately, and you may have a minimum order requirement for the pail, but when you have a job that needs a square pail, these are the ones.