That's an excellent and practical question! It shows you're thinking about real-world solutions, not just aesthetics. From my experience maintaining community spaces, the depth of the bin is crucial, but it's part of a larger system to fight wind.
First, let's talk numbers. A good rule of thumb is a minimum depth of 30 to 36 inches (about 75 to 90 cm). This provides enough vertical space for trash to settle under its own weight, creating a buffer between the top of the waste and the rim. In very windy coastal or open-plain areas, I'd lean toward the deeper end of that range or even consider 40-inch models.
Why does depth matter? A shallow bin fills up quickly, leaving bags and loose items right at the opening. Wind can easily catch the edges of plastic bags, food wrappers, or paper cups and lift them out. A deeper bin allows you to fill it more before the contents become vulnerable, and gravity helps keep everything lower down.
However, depth alone isn't a magic fix. You must pair it with two other critical features:
1. A Secure, Well-Fitting Lid: This is non-negotiable. A heavy, hinged lid that closes tightly—like a dome lid or one with a flip-top—is far more effective than a simple, light cover. It blocks wind from entering the bin in the first place.
2. Proper Weight or Anchoring: Even a deep, lidded bin can tip over in a storm. Choose bins with a weighted base or ones designed to be anchored to the ground or a pad. This stability is key.
My final piece of advice is about placement and habit. Place bins in sheltered spots, like beside a wall or fence, to break the wind's force. And most importantly, empty them before they become overfull. An overflowing bin, no matter how deep, will always create litter.
So, while aiming for a bin at least 30 inches deep is a smart start, remember to prioritize a secure lid and stable placement for a truly effective solution against blowing litter.