Wiktionary
polybag
n. A plastic bag used to package a number of things together, but especially one used to package small supplementary publications that would otherwise fall out of a newspaper or magazine
Usage examples of "polybag".
He reached into a pocket and withdrew a small polybag of white powder.
He reached out a fat hand for the polybag, hesitated, then pulled it back.
Vanderling said, reaching into a pocket and pulling out a small polybag of Omnidrene.