There are 6 cargo bays in the game. They are progressively more expensive as their quality increases. New cargo bays can be purchased at the junk shop. The cargo bay of your ship defines the the amount of ore and gems you can carry whilst still being able to fly.

Effect - Code

Gigantic Bay (40 Cu ft,) - Buy for $5,000
Huge Bay (25 Cu ft,) - Buy for $2,000
Leviathan Bay (120 Cu ft,) - Buy for $100,000
Medium Bay (15 Cu ft,) - Buy for $750
Micro Bay (<15 Cu ft,) - Start a new game
Titanic Bay (70 Cu ft,) - Buy for $20,000