Strangely, infusing a bottomless bundle with ink of one color seems to add another slot dedicated to another item to it, and doing so with 16 colors yields this stylish rainbow patterned bundle that seems to carry an inordinate number of 16 different types of items, though the total storage space is still limited by the size of the bundle. It seems to output the item that's stored in the slot matching what ever color its dyed to at the moment. First color i did only seemed to change the color of the bundle though.