Potion flasks are specialised storage items that can hold up to nine units of a single type of potion. They can be filled either manually or by using the Potion Flasker Slimefun machine. Filled potion flasks can be emptied directly into chests. Filled Potion flasks do not stack.
An Empty Potion Flask is crafted using Slimefun. Empty flasks can be filled in two ways:
To empty the contents of a filled potion flask into a storage block, right-click the block with the flask in your hand.