A lawn mower for mowing lawn. There is: a lawn mower base, having a first transport hole; an external collection container, having a second transport hole and a first transport flap; and an internal collection container having a third transport hole and a first elongated ductile connection member. There is also a second elongated ductile connection member coupled to the internal collection container. The transport flap is removably coupled to the external collection container by zipping. The internal collection container comprises a plurality of slit portions. The external connection container comprises a plurality of connection hooks, and the internal collection container comprises a plurality of connection bands. The internal collection container comprises a plurality of ventilation holes opposite the third transport hole.