"仓库容积" can be translated into English as "warehouse volume" or "storage capacity of the warehouse".
"Warehouse volume" directly refers to the volume or space within the warehouse.
"Storage capacity of the warehouse" emphasizes the maximum amount of goods or materials that the warehouse can hold, which is closely related to its volume but focuses more on the functional aspect of storage.
In most contexts, "warehouse volume" would be a straightforward and appropriate translation.