[GWN7]

From the interweb:

a lid, a baggie, an ounce
The term 'lid' of marijuana goes back to the 60's. Back then you could buy a 'lid' or a 'can' of pot. The can was aproximatley 1 oz, the lid was1/8 oz. The term came from the practice of breaking up a brick (a kilo or later a key) of tightly packed marjijuana and storing and selling it in Price Albert tobacco cans. A can held aproximatley one ounce. the lid would hold aproximatley1/8 oz. No one weighed it really, it was all done by eye. By the time I was in high school in the early 70's the term can had gone away and the term lid referred to an ounce. The term nickel or dime bag was still used in the 70s too. But by that time the amount of pot in the nickel ($5) or dime ($10) would vary - though the price was still $5 or $10. But if you bought a 'baggie', it would contain an ounce and the price would vary. In the 60's a bag was a bag was a can was an ounce and the price for the ounce was 5 or 10 depending on quality. I don't know if there were 7 dollar bags or 8 dollar bags.