The Heavy Duty Nest Leg option does a good job of keeping baskets secure while in stacked position. This custom HD stacking feet design helps keep baskets from shifting during movement especially when stacks of baskets are being moved around the warehouse or shipped collapsed. This design is also an extra layer of protection for the feet. The HD Nest leg almost acts like a post protector. The entire extra piece of steel wraps around the existing foot. It is an extra layer of steel protection that helps prevent damage to the leg and foot when a fork hits it. The feet stack on each other when collapsed kind of like they do when the basket is fully assembled. When a forklift rolls down the aisle and makes a swift turn to the left, these baskets should not tip over because they are nestled together.