That's a great and very important question! Throwing sensitive documents directly into a public bin is a big risk. Anyone could retrieve them. The most secure method is a two-step process: destroy first, then disguise.
First, never dispose of documents intact. If possible, shred them thoroughly with a cross-cut shredder before you leave home or office. This turns them into confetti. If you don't have a shredder, manually tear them into small pieces, separating sections with your name, address, account numbers, and signatures. Rip them multiple times.
Second, when using the public bin, don't just drop the shreds in loosely. Place them inside another sealed bag, like an old chip bag, a used food container, or a general non-transparent trash bag. This adds a layer of disguise and makes it much harder for someone to casually pick out your information.
For ultimate security, consider holding onto the shreds until you can mix them with wet waste (like coffee grounds or food scraps) in a secure bag at home before disposal. The best practice is to avoid public bins for highly sensitive items altogether and use a professional shredding service or a secure home shredder. Stay safe