In your inventory, you have 27 space including 
Tools and 
Materials . A space is occupied when you have an item, but you can have 1 or 7 million of it and it still only occupies one space.
You can expand your space by another 27 when you buy a 
Chest (1500
) or you can craft it for 750 of any wood
.
When your space is full, you cannot do // and take/put items from the chest. You can make more space by doing or . To take/put items out of or in the Chest use
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