Every bank starts with 20 slots. Each different item takes one slot, however many of it you hold.

Buy slots in the Shop

Each Extra Bank Slot adds one slot. The first costs 34 GP. Every later slot costs more than the one before, and from your 119th purchase on each slot costs 5,000,000 GP.

Bank slot costs adds up the price of the slots you plan to buy and shows how many of them your GP pays for. Import Save fills in the slots you have bought, your game mode and your GP from your save.

In Hardcore Mode you can buy at most 88 Extra Bank Slots.

Slots that cost no GP

These add space without counting as a purchase, so they never raise the price of your next Extra Bank Slot:

Into the Abyss

Into the Abyss sells a second Extra Bank Slot for 5,000,000 AP each. Its price stays the same for every slot, and Hardcore Mode allows at most 88 of these too.

Bank slot costs