Washing machine for the washing of laundry such as clothes and textiles, which washing machine has a main part that comprises: an inlet, for supplying washing water, an outlet, for disposal of washing water, a pump, in order to pump the washing water, a connection unit for fluid tight connection of a washing bag to the main part. The washing bag has fluid tight walls and is removably connectable to the connection unit of the main part, wherein the pump is arranged to pump water and air from the washing bag in order to create a certain negative pressure inside it with respect to the surrounding atmospheric pressure and by that emptying it of washing water.