An airtight pot is a quest item used in the One Small Favour quest. It is made by talking to Tassie Slipcast in Barbarian Village in the building with the pottery oven after completing her favour. She will teach the player how to make a pot lid which can then be put on a regular pot to form an airtight pot.
This must then be given to the Apothecary in Varrock in order to complete the next step in the quest. This item is also used in the Swan Song quest, in which it holds bone seeds to create an army of skeleton mages.
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