A big bag of sweets, potato chips or condoms.

More precisely, a bundling of many items together which are normaly sold separately. The idea being that you are purchasing many of the item, which is normaly purchased in small quanitities for individuals, for a large quantity of people. Thus for a party.

Often there is a cost benefit involved in purchasing the items in bulk. This entices people to bend the rules and purchase the party pack even in the absence of a party.

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