An apparatus and parts for forming a size-adjustable receptacle are disclosed. In some embodiments, a part of a receptacle is provided, the receptacle being assembled from a plurality of parts. The part of the receptacle includes a surface having formed therein a plurality of protrusions suitable to mate in interlocking cooperation with protrusions of a second and third part of the receptacle, such that a choice of which protrusions of the first part to mate with protrusions of the second and third parts, determines a size of the receptacle.
