That's a great question! Keeping bags secure in public trash cans is a common urban challenge. Loose bags can lead to messy spills, attract pests, and create extra work for sanitation crews. Here are a few practical recommendations I've found work well.
First, if the bin has a liner or inner rim, try tucking the top edges of your bag over it. This creates a simple anchor point. For bins without liners, using bags with built-in drawstrings is a game-changer. Simply pull the strings tight and, if possible, tie them to the bin's handle or a side opening.
Another clever trick is the "double bag" method. Place your primary bag inside a slightly larger, sturdier bag. The friction between the two layers often helps them stay in place better. For a more permanent solution, consider using small bungee cords or reusable velcro straps across the top of the can to hold the bag's lip in place—just remember to remove them when the bag is full.
Ultimately, using the right-sized bag is key. A bag that's too small won't have enough material to grip the can, while an oversized one is clumsy and prone to falling in. The goal is a snug fit. These small steps make a big difference in keeping our shared spaces cleaner and more pleasant for everyone.