I am so kriffing forgetful sometimes, thanks for the help. I had bought something with Cartel coins and needed to store some stuff in the cargo bay so I had room in my inventory.
FWIW, you can access your cargo bay on most planets without heading all the way back to your ship. Look for the key icon on your map. Most planets have cargo bay access near the main spaceport, marketplace, and/or cantina.
On Coruscant, you can take the stairs to your right or left as you walk towards the Senate building to enter a marketplace area. Cargo bay access is located near the GTN terminals, as I recall.