Bank

The Bank is a location at the spawn where players can deposit their items, swap gold nugget  for emeralds to increase storage capacity, and gamble at slot machines.

Storage
The bank contains 4 Enderchests  where one can store his excess items, these chests are often used for more valuable commodities that will not be used often.

Currency swap
Aside from the Enderchests the bank contains 4 'Banker' NPCs that will swap one stack of gold nuggets for one emerald and vice verse, emeralds have the same worth as gold nuggets but occupy less space than the common nugget, as a stack of emeralds is worth 64 stacks of nuggets you effectively save more and more space.

Slot machines
Minecraftapocalypse uses a slot machines plugin whereas you can purchase slotmachine coins which can be inserted in the slot machines located on the top and bottom floors of the bank. Every slot coin used raises the jackpot's worth and once a player has won the entire jackpot is rewarded to him and the cycle begins again.