Cargo hold

Most other rooms on a ship can't safely hold items. Cargo holds are the only room onboard a ship you can drop items in. If you somehow manage to drop something in another, it will tend to fall overboard. Each cargo hold is to carry 1000 kg worth of materials or 150 items.

Forges

Class 4 ships can have mobile forges and workbenches placed in their cargo holds, to the limit of one forge per hold. They take up 250kg of hold space, but can contain 500kg worth of materials. All of the forges can be bought from Silver lake for 47,850-123,500 gold. If you would like to rearrange their placement in your cargo holds, it will cost one tenth of the current forges cost.