Collecting bag for connection to a non-natural body opening (stomata) in humans and used for collecting aqueous excrement flowing out of the stomata comprises an absorbent fleece incorporated in a plastic bag so that the liquids flowing into the bag are absorbed and stabilized. Preferred Features: The fleece is pyramid- or tear-shaped. The length at the base is 11 cm and the length at the tip is 5.5 cm, with a variation of plus or minus 2 cm.