One of the great things about the Aspire Nautilus AIO is that you don't have to replace the whole cartridge whenever you use up a coil: you just drop a new Aspire Nautilus BVC Vape Coil in, and keep going. But still: spare Nautilus AIO pods are a great investment. Keep a couple around, each with a different vape juice, so you don't have to use up a whole Nautilus AIO tank just to switch e-liquids. Or keep a spare with that flavor that just won't ever wash out of your tank - I'm looking at you, Napalm! At these prices, you can afford to pick up a few, just in case!