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Slang for one ounce of cannabis, a common purchasing unit equivalent to 28 grams.
Zip is cannabis slang for one ounce (28 grams) of flower. The term comes from the fact that an ounce of cannabis fits neatly into a standard Ziploc-style sandwich bag, which became the standard packaging in the pre-legalization era when most cannabis was sold in plastic baggies.
Cannabis has its own measurement hierarchy. From smallest to largest: a dime bag (1 gram), an eighth (3.5 grams), a quarter (7 grams), a half (14 grams), and a zip or ounce (28 grams). A zip is a significant quantity, enough for most consumers to last several weeks to a month depending on usage. In many legal markets, one ounce is the maximum amount that can be purchased in a single transaction and the maximum that adults can legally possess in public.
The phrase pick up a zip is common in cannabis culture and hip-hop lyrics. Zip prices vary dramatically by market and quality: in legal US states, a zip of quality flower might cost $100 to $400, while premium exotic strains can command more. In pre-legalization markets, the price of a zip was a key economic indicator of local supply and demand. The term remains widely used in both legal and legacy cannabis communities as one of the standard units of cannabis measurement.