That's an excellent and very practical question! Finding a trash bin that can handle intense sun and summer heat without deforming is a common challenge. Based on your need for something that withstands very high temperatures without warping, I have a few strong suggestions.
Your best bet is to look for bins made from metal, specifically powder-coated steel or galvanized steel. These materials are inherently heat-resistant and won't warp or melt. They can get hot to the touch in direct sun, but their structure remains completely solid. They are also typically very durable against weather and pests.
If you prefer a plastic option, you must be very selective. Avoid standard, thin plastics. Instead, look for high-density polyethylene (HDPE) or polypropylene bins marketed as "premium," "commercial-grade," or "all-weather." These higher-quality resins have a much higher melting point and are formulated to resist UV rays and heat distortion. Brands like Rubbermaid or simplehuman often use these materials for their outdoor lines.
Another great option is concrete or stone composite bins. They are extremely heavy and stable, completely impervious to heat warping, and offer a very permanent, upscale look.
My top recommendation: Go for a powder-coated metal bin. It offers the absolute best combination of heat resistance, durability, and longevity for the price. Be sure to check the product specifications for terms like "heat-resistant" or "all-season" to confirm its suitability.
I hope this helps you find the perfect durable solution for your space