That's an excellent and practical question for park management. Based on durability, the top contenders are typically heavy-duty galvanized steel and commercial-grade plastic bins.
For maximum longevity and vandal resistance, you can't beat heavy-duty galvanized steel trash cans. The steel is coated to resist rust, and they can withstand significant impact and harsh weather for decades. They are heavier, making them harder to tip over or steal, but they come at a higher initial cost.
A fantastic and very common alternative is commercial-grade polyethylene plastic. High-quality ones are rotationally molded as a single piece, with no seams to split. They are naturally rust-proof, resist graffiti (which often wipes off), and don't dent. While not as immovable as steel, their lighter weight makes them easier to service. Look for ones with UV inhibitors to prevent fading and cracking.
Key features to prioritize for durability include:
* Vandal-Resistant Design: Smooth surfaces, hidden hardware, and secure, locking lids.
* Robust Mounting: Anchoring systems to secure the bin to a concrete pad.
* Commercial-Grade Components: Thick walls and heavy-duty lids and hinges.
For a busy city park, a combination often works best: ultra-durable steel bins in high-vandalism areas and commercial plastic bins for general use. The investment in quality upfront saves significantly on replacement and maintenance costs over time.