Flexible container for dog excrement

The invention relates to a container for use on a dog leash, where it is usual for the container to consist of one or more fixed inflexible parts that do not allow for the volume of the container to be folded. What is new about the creation is that the container consists of a collapsible part containing space of inside and outside. Space on the outside of the container is intended for empty collection bags or dog treats, space on the inside of the collapsible part is intended for filled collection bags with dog excrement. By unbuttoning a button, the collapsible part can be unfolded completely, thereby increasing the overall volume of the container and creating space on the inside of the container for collection bags with dog excrement when opening a zipper