The Bucket Sling / Sling Sink is rectangular to make it tip- and flip-proof.

Conventional buckets, originally designed to pour out contents with ease (think of pouring paint), hang from a rigid metal handle that attaches to the container at two points. Their design makes them inherently unstable and tippy when hung. They roll and shift against flat surfaces such as vehicles walls or fence posts. The Sling Sink / Buckets Sling's four-point hanging system creates a stable sink that resists tipping, flipping or swaying no matter where you use it, or how it is hung up.