That's a practical question! When you're dealing with a standard 50-gallon outdoor trash can, the empty weight is something you definitely notice when moving it around. Generally, you can expect an empty 50-gallon outdoor trash can to weigh between 20 and 30 pounds (approximately 9 to 14 kilograms).
This weight isn't arbitrary; it comes from the materials and construction. Most of these cans are made from durable, molded plastic like high-density polyethylene (HDPE) or polyethylene (PE). This material is chosen specifically because it needs to be tough enough to withstand sun exposure, rain, wind, and the occasional rough handling, all without cracking. The plastic has to be thick to provide this durability, which directly contributes to the heft you feel.
You might find some variation in weight. A basic, residential-grade model might be on the lighter end of that scale, while a commercial-grade or "bear-proof" bin, which has thicker walls and reinforced structures, will likely be heavier. The inclusion of features like sturdy wheels, a locking lid, or metal reinforcement bars will also add a few extra pounds.
So, while it's not extremely heavy, that 20-30 pound weight is substantial enough to indicate a robust product built for long-term outdoor use. It's always a good idea to check the product specifications from the manufacturer for the most precise weight for the specific model you're considering.