The preferred packaging envelope for heroin, also popular with jewelers and philatelics (stamp collectors). Glassine bags are non stick and do not promote condensation and are easilly stamped with a logo in order to promote brand recognition.
I had to stop at the head shop to pick up some more glassine bags because I used the last box to bag up a a few bricks.
Heroin packaged in a glassine bag then sealed in a plastic sleeve to prevent tampering and protect against moisture. Also a popular spot on 7th and C (Loisada) in NYC where quality heroin products were sold.
It started to pour rain, and I was getting soaked thank god the bundle in my pocket was from bag in a bag.