Inventory Size

I note that a problem described by Phillip is people with huge inventories. Running to "terabytes". Well, speaking as someone with a largeish inventory, I think it would be cool if we could be given some idea of how much space our inventory is taking up? That we we can be responsible people, remembering to empty the trash and deleting items as required until we have a total inventory size that doesn't make us feel guilty, at least. It might even help sort out the PROBLEMS.