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A pack or packet of cigarettes is a rectangular container, mostly of paperboard, which contains cigarettes. The pack is designed with a flavor-protective foil, paper or biodegradable plastic, and sealed through a transparent airtight plastic film. By pulling the "pull-tabs", the pack is opened. Hard packs can be closed again after opening, whereas soft packs cannot.

Cigarette packs often contain warning messages depending on which country they are sold in.

The size of a pack is often regulated. Government agencies usually set a minimum pack size.

In Australia, the most common quantity per pack is 25, although some brands have changed them to 26, second to 20 which by law, is the minimum. 30, 40 and even 50 packs are also sold.

In Canada, most packs sold have 25 cigarettes, but packs of 20 are also popular.

In many European countries, increases of cigarette tax can cause the quantity of cigarettes in the pack to change, in order to achieve the same end price.

In Malaysia, the selling of packs containing fewer than 20 cigarettes is prohibited.

In the United States of America, the quantity of cigarettes in a pack must be at least 20. Certain brands, such as Export As, come in a pack of 25. For many years, half-packs of 10 (or even 14) cigarettes were commonly available.

In the United Kingdom brands are usually sold in packets of 20 but most popular brands are also available in 10s. Vending machines often dispense packets containing 16 or 18 cigarettes, although the dimensions of the packaging are the same as the equivalent packet containing 20. Despite this, due to plain packaging laws being enforced in May 2017, packs of 10 will be banned from UK markets, along with branded packaging no longer being sold.

A carton of cigarettes usually contains 10 packs, totaling 200 cigarettes. Some cartons contain twenty packs, totaling 400 cigarettes.

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