That's a great question! A floppy bag that falls into a big bin is a total nuisance. The best way to mount it depends on your bin's design, but the goal is always to secure the bag's lip firmly over the rim.
For most standard large bins, the simplest and most effective method is using a bungee cord with hooks. Stretch the cord around the circumference of the bin, hooking it under the lip or through handles. It creates downward pressure that pins the bag's edges in place, even in wind.
If your bin has a rolled or thick rim, large metal binder clips or sturdy spring clamps are fantastic. Space several around the rim to grip the bag tightly. For a permanent solution, consider installing utility hooks or small L-brackets on the inside lip to catch the bag's drawstring or loops.
Another pro tip is to use a secondary smaller liner or a fixed plastic bag holder inside the bin. This acts as a permanent catchment, and you just place your primary bag inside it. This double-layer system prevents tears and contains leaks.
Finally, always ensure the bag is fully opened and spread out before securing it. Avoid overfilling, as weight is the main cause of slippage. With these tricks, you'll say goodbye to fishing bags out of the bottom of your bin!