That's an excellent question that gets to the heart of value versus initial price. While the sticker shock might steer you toward plastic, the long-term story is often different. Let's break it down naturally.
First, the upfront cost is clear: plastic bins are almost always cheaper to buy. You can get a decent-sized plastic bin for a fraction of the cost of a comparable galvanized steel or aluminum one. This makes plastic the easy, budget-friendly choice for immediate needs.
However, the "over time" part is where the comparison shifts. A quality metal bin, while a bigger investment initially, is built to last. It can withstand intense sun without becoming brittle, resists cracking in freezing temperatures, and isn't easily chewed by pests. A good metal bin can easily last 10, 15, or even 20 years with minimal care—maybe just an occasional rinse to prevent rust spots.
Plastic bins, unfortunately, have a shorter lifespan in the elements. UV rays from the sun cause the plastic to fade and become brittle over time. After several years, you might notice cracks, especially around the handles or lid hinges, or the plastic may simply shatter in a cold snap. Replacing a plastic bin every 5-8 years becomes a recurring cost.
There are other practical considerations. Metal bins are heavier and more stable in high winds. They are also typically more fire-resistant. Plastic bins are lighter to move and won't rust, but they can be blown over easily and may retain odors more.
So, which is cheaper over time? If you plan to stay in your home for many years and want a "set it and forget it" solution, the higher durability of metal often makes it the more cost-effective choice in the long run. You pay more once, not repeatedly. For a temporary situation or if upfront cost is the absolute priority, plastic works. But for permanent outdoor use, investing in metal usually means you're buying your last trash can for a long, long time.