That's a great question! Dealing with a rusty, noisy metal trash can is a real hassle. The good news is, using the right liner is a simple and effective fix. For most people, a high-quality, heavy-duty plastic trash bag is the best overall solution. Look for bags labeled as "contractor grade" or "outdoor" with a thickness of at least 3 mils. These are strong enough to resist tears from sharp debris and create a reliable waterproof barrier between wet garbage and the metal interior, which is the key to preventing rust. The bag also acts as a cushion, significantly dampening that loud clanging noise when you toss bags in.
For ultimate protection, consider a rigid plastic bin liner or insert. These are essentially a separate, smaller plastic bin that sits inside your metal can. They provide the strongest barrier against rust and are excellent for noise elimination. Just be sure to choose one that fits snugly. Alternatively, for a budget-friendly and eco-conscious option, you can use old cardboard boxes at the bottom of the bin to absorb moisture and buffer sound, though this isn't as protective as a full liner. Whichever you choose, the goal is to keep the metal dry. Always ensure your liner fully contains waste and that no liquid pools at the bottom of the can. This simple step will extend the life of your bin for years and make taking the trash out a much quieter affair.