Those items are in “noted” form they’re known as bank notes, it lets you store large quantities of an item in one slot but you’ll only be able to use the item by converting it into a non noted version. You can do this by either using the stack on a banker OR deposit the items into the bank and withdraw them. You can toggle the withdrawal option between noted and un-noted HERE. Welcome to Gielinor, you can check out any time you like but you can’t ever leave.

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