If you're dealing with a tall, narrow public waste bin, I know exactly the struggle—the bag keeps slipping down or tearing at the edges. The best way I've found to fasten a liner bag inside such a bin is to combine a few simple tricks that keep the bag securely in place without constant adjustments.
First, start with a bag that's slightly larger than the bin's opening, so you have extra material to work with. This allows you to fold the bag's edge outward and over the rim, creating a snug lip. Then, take a bungee cord or a heavy-duty elastic band—something with a good grip—and wrap it tightly around the bin's outside rim, catching the folded bag fabric. For a tall, narrow bin, this elastic tension is key because it prevents the bag from slipping down under the weight of trash. If you don't have a bungee, a simple tension ring or a bin bag fastener clip works wonders too.
Another pro tip: before inserting the bag, place a small piece of adhesive Velcro or a non-slip mat inside the bin's bottom. This gives the bag a bit of friction and stops it from sliding sideways. Also, don't overfill the bin—leave a few inches of space at the top to reduce stress on the fastener. In public settings, I've seen janitors use a zip tie through the bag and a tiny hole drilled in the bin's rim, but that's a more permanent solution. For regular use, the elastic band method wins because it's quick, adjustable, and doesn't damage the bin. Try it out—you'll notice your liners stay put even in narrow bins that seem impossible to manage.