What are the best methods to prevent warping in stacked polypropylene trash cans?

Warping in stacked polypropylene trash cans is a common issue that compromises functionality and aesthetics. Fortunately, several effective methods can prevent this problem. First, avoid stacking cans when they are exposed to high temperatures, such as direct sunlight or hot storage areas, as polypropylene softens and deforms easily under heat. Store them in a cool, shaded place instead. Second, ensure proper ventilation between stacked bins to reduce heat buildup and allow air circulation; using spacers or not over-stacking can help. Third, distribute weight evenly—avoid overloading the top can, which pressures the lower ones. Fourth, choose high-quality, UV-resistant polypropylene trash cans designed for stacking, as they are less prone to warping. Regular cleaning and maintenance also prevent material degradation. By following these practices, you can extend the lifespan of your trash cans and maintain their structural integrity.