Sentence:  In the Philippines and other parts of Southeast Asia, the problem was compounded by a new kind of plastic packaging that took flight in the 1980s — the <WSD>sachet</WSD>. It was a plastic pouch but often bulked up with layers of aluminum or paper for shape or durability. ... <WSD>Sachets</WSD> are cheap, flashy and convenient. 
Meaning of the word marked with <WSD> tags:  A small, sealed packet containing a single-use quantity of any material.