That's an excellent question for anyone managing a public space. From my experience in urban planning and facility management, durability isn't about a single "toughest" material, but a combination of design, construction, and smart features tailored for abuse.
For the absolute hardest use—think major transit hubs, downtown cores, or stadium plazas—the consensus often points toward heavy-duty stainless-steel cans, specifically brands like Toter Commercial or United Receptacles. Their 304-grade stainless steel bodies resist corrosion and dents remarkably well. More crucial than the metal alone is the design: a single-piece, welded body (no seams to pry open) with a secure, internal-locking mechanism for the liner frame is key. Look for models with a small, reinforced opening; large apertures invite oversized bags and debris, leading to damage.
However, "durable" also means vandal-resistant. Brands like Pilot Rock or Victor Stanley excel here with features like tamper-proof bolts, anti-graffiti coatings (often a powder-coat over steel), and anchored, concrete-infill bases that prevent tipping and theft. For very high-traffic zones, a two-piece, locking post-and-can system is the gold standard.
A critical, often overlooked factor is ease of service. A can that's difficult to empty leads to neglect. Brands like Rubbermaid Commercial offer sturdy, rotationally molded polyethylene cans with wide mouths and smooth interiors that are surprisingly resilient against impact and weather, and are very easy for crews to handle. Their durability comes from simplicity and maintenance ease.
So, while stainless steel from Toter or United often tops the list for sheer indestructibility, your true "most durable" choice depends on your specific threat (vandalism vs. wear-and-tear) and maintenance logistics. The best investment is in a can with minimal seams, robust internal hardware, and a design that makes daily servicing straightforward. Always request a sample or review a unit in person—the quality of the welds and latch mechanism tells you everything.