Why will there be a 150ml 2-in-1 cartridge opposed to the usual 180ml 2-in-1cartridge?

The 2-in-1 cartridge with a capacity of 180ml is not available from our supplier for the time being. In order to meet our customers’ demand for a 2-in-1 cartridge, we have sourced an alternative. The solution for the meantime is to supply our 2-in-1 products in a 150ml cartridge, these will become available in September/October.