That's a great question! A slipping liner in a deep public bin is a real nuisance, leading to mess and inefficiency. Here's what tends to work best, based on practicality and cost.
First, the liner itself matters. Use heavy-duty, appropriately sized bags. Standard kitchen bags are too weak. Look for tall, drawstring bags designed for commercial bins; the extra thickness and the drawstring are key features.
Preparation is crucial. Ensure the bin interior is completely dry and free of debris before inserting the new liner. Even a little moisture or a piece of old garbage can act as a lubricant, causing the bag to slide down.
The most effective method is a simple mechanical hold. After placing the liner in the bin, pull the top cuff over the rim evenly. Then, use a sturdy, removable bungee cord or a heavy-duty rubber band around the outside of the bin to cinch the liner tightly against the rim. This creates strong friction and prevents slippage, even when heavy items are tossed in. For permanent bins, installing simple inward-facing clips or hooks under the rim can provide anchor points for the bag's drawstring.
For bins without external fasteners, try the "double bag" method. Place a slightly smaller, rugged bag inside your primary liner. The friction between the two bags often reduces slippage. Also, avoid overfilling. When a bag is too heavy, gravity wins. Regular emptying is part of the solution.
In summary, combine a heavy-duty drawstring bag with a dry bin and a securing bungee cord for the most reliable fix. It's a small effort that maintains cleanliness and makes waste collection much smoother for everyone.