Bank

• The bank starts with 24 slots, one per distinct item.
• Common and uncommon items need a slot. Rare and better always fit, even past the limit, so a full bank never destroys a lucky drop.
• When a new common item has no room, the action stops ("Bank full"), offline too. In combat, common loot is skipped instead and the fight goes on.
• Crate contents, expedition cargo and harvests always fit.
• Expansions add +4 slots for gold, up to 400 slots. Each costs 60% more than the last (rounded to 10 gold).

Expansion costs

#	Slots	Cost (gold)
1	24 → 28	250
2	28 → 32	400
3	32 → 36	640
4	36 → 40	1,020
5	40 → 44	1,640
6	44 → 48	2,620
7	48 → 52	4,190
8	52 → 56	6,710
9	56 → 60	10,740
10	60 → 64	17,180
11	64 → 68	27,490
12	68 → 72	43,980
13	72 → 76	70,370
14	76 → 80	112,590
15	80 → 84	180,140
16	84 → 88	288,230
17	88 → 92	461,170
18	92 → 96	737,870
19	96 → 100	1,180,590
20	100 → 104	1,888,950
21	104 → 108	3,022,310
22	108 → 112	4,835,700
23	112 → 116	7,737,130
24	116 → 120	12,379,400
25	120 → 124	19,807,040