Which item is typically used for packaging heroin and is the size of a pencil eraser?

Tiny knotted balloons are commonly used for packaging heroin, particularly due to their small size and the ability to be securely tied, which helps contain the substance while minimizing the risk of leakage. The size of these balloons makes them particularly suitable for discreet transportation and concealment. They can easily fit into pockets or small compartments, making them a preferred choice among users and dealers.

While plastic baggies, pill bottles, and small metal containers are also used for packaging various substances, they do not typically match the size and functional characteristics that tiny knotted balloons offer when it comes to heroin. Balloons allow for a compact, discreet method of packaging, which is essential in illegal drug transactions.