A drainage hag system for urinary collection comprises a urinary drainage bag (14) comprising a first inlet (16) and an inlet valve for regulating a flow of urine from a catheter (12) into the urinary drainage bog (14) via the first inlet, an outlet (22) and an outlet valve (24) for regulating a flow of urine (20) out of the urinary drainage bag (14). The drainage bug system further comprises a receptacle bag (26) of a foil or sheet material for emptying the urinary drainage bag (14) and comprising a receptacle compartment (28) for storing urine, and a connector for providing a connection between the receptacle bag (26) and the urinary drainage hag (14). The connector provides a second inlet constituting a receptacle inlet to the receptacle compartment (28) when connected to the receptacle hag (26) such that urine can flow into the receptacle compartment (28).