The invention relates to a device for applying flowing media to a surface. Said device comprises a container for the media with at least one opening which is located above the surface and can be deaerated and a mopping or applicator device which is attached to a handle. In addition, the device has a flow-regulating hose which can be shut off, for conveying the media form the container by force of gravity to an outlet on the mopping or applicator device. In addition, the device has a portable unit which is worn on the back, comprising supporting and fixing straps and a mounting plate which is fitted to said unit and which has a rapid-action coupling device. The container has a resealable exit opening at one end with a connecting sleeve and a resealable fill opening at the opposite end, in addition to a hose adapter which can be connected to the connecting sleeve of the exit opening. Said adapter has a shut-off device and a rapid-action coupling for the hose with a drip-protection unit.