Capacity

Capacity is the number of Resources that can be held in your city without a Warehouse. Every new city you build when you establish a city is 5,000 total resources for everything Food, Steel, Oil, and Rare Metal. 
* Level 1 - 10,000 Capacity 
** Base Capacity is raised to 15,000. 
* Level 2 - 22,000 Capacity
** Base Capacity is raised to 37,000. 
* Level 3 - 49,500 Capacity
** Base Capacity is raised to 86,500. 
* Level 4 -