That's a great and often overlooked question! Figuring out if a public trash bin is at a comfortable height is mostly about ergonomics and observing your own body. Here’s a simple, natural way to check next time you're out.
First, approach the bin as you normally would to throw something away. The ideal test is if you can comfortably deposit your trash without having to significantly bend your wrist upwards, hunch your back, or lift your elbow awkwardly high. Your forearm should be roughly level or at a slight downward angle when your hand is over the opening. If you find yourself doing a mini "toss" because the opening is too high, or bending deeply at the waist because it's too low, the height is probably not optimal for you.
For reference, many accessibility guidelines suggest that the operable parts (like the opening or push flap) of public fixtures should be between 15 to 48 inches (38 to 122 cm) from the ground. A comfortable height for most adults is often around waist level. However, the "right" height can vary. A bin meant for quick pedestrian use on a busy sidewalk might be higher than one designed for use near a park bench where people are seated.
Listen to your body. Discomfort or strain is a clear sign. A well-designed bin should make disposal feel effortless, not like a chore. Ultimately, a bin that feels right is one you can use naturally without a second thought.