a dub sack contains .7 to 2.5 grams depending on location

a bag with $20 worth of any drug in it. for weed its usually about a gram

A $20 bag of weed. 14 grams is a lot to get for $20. In Australian currency for $20 you get 2 grams, but translated into U.S dollar's that would be $40 Australian.(ie. 4 grams for $20US).

Can also be used to mean any bag of chronic.

A bag of weed that costs 20$.

an infamous wine cask made in melbourne's west suburbs.... cheapest way to get drunk

Back when weed usually came in $10 dime bags a double bag was $20. When asking your favorite retailer for your weed if you preferred a larger quantity you would ask for a dub, dub bag or as in today’s vernacular a good ol dub sac.

4 grams of pot in stl. or 50 for 3.5 of kind