An attachment interface for attaching a container to a suspender of a shelfless support structure of an automated storage system, wherein: - the container comprises: ∘ a base extending across an area that has a center point and an imaginary center axis extending through the center point; ∘ a casing with a bottom end connected to the base and a top end opposing the bottom end and defining an opening for accessing the container, which casing extends from the base in a direction having a component parallel to the center axis; ∘ a rim, which extends from the top end of the casing away from the center axis, and ∘ a bottom-facing skirt which extends from the rim, - the shelfless support structure comprises a plurality of suspenders configured to be attached to and inside of an enclosure of the storage system in a mutually superposed configuration, wherein each suspender comprises: ∘ a body having a height in a first Cartesian dimension defined between a top end and a bottom end and a width in a second Cartesian dimension and ∘ a lip configured to be introduced to a gripping space defined by the casing, rim and skirt of container, wherein - the lip of the suspender extends from a top end of a body of the suspender above and towards one side thereof; - each suspender comprises a plurality of notches provided to the lip for accommodating respective skirts of the plurality of containers, and in that - each suspender comprises a shoulder for engaging casings of the plurality of containers, the shoulder extending from the bottom end of the body below and towards said one side thereof. - the container comprises: ∘ a base extending across an area that has a center point and an imaginary center axis extending through the center point; ∘ a casing with a bottom end connected to the base and a top end opposing the bottom end and defining an opening for accessing the container, which casing extends from the base in a direction having a component parallel to the center axis; ∘ a rim, which extends from the top end of the casing away from the center axis, and ∘ a bottom-facing skirt which extends from the rim, ∘ a base extending across an area that has a center point and an imaginary center axis extending through the center point; ∘ a casing with a bottom end connected to the base and a top end opposing the bottom end and defining an opening for accessing the container, which casing extends from the base in a direction having a component parallel to the center axis; ∘ a rim, which extends from the top end of the casing away from the center axis, and ∘ a bottom-facing skirt which extends from the rim, - the shelfless support structure comprises a plurality of suspenders configured to be attached to and inside of an enclosure of the storage system in a mutually superposed configuration, wherein each suspender comprises: ∘ a body having a height in a first Cartesian dimension defined between a top end and a bottom end and a width in a second Cartesian dimension and ∘ a lip configured to be introduced to a gripping space defined by the casing, rim and skirt of container, wherein ∘ a body having a height in a first Cartesian dimension defined between a top end and a bottom end and a width in a second Cartesian dimension and ∘ a lip configured to be introduced to a gripping space defined by the casing, rim and skirt of container, wherein - the lip of the suspender extends from a top end of a body of the suspender above and towards one side thereof; - each suspender comprises a plurality of notches provided to the lip for accommodating respective skirts of the plurality of containers, and in that - each suspender comprises a shoulder for engaging casings of the plurality of containers, the shoulder extending from the bottom end of the body below and towards said one side thereof.