Expandable contractable recycling bin

A modular receptacle system for storing refuse or recyclable materials, the modular receptacle system comprising:

• a plurality of collapsible bins, a given one of the plurality of bins comprising:
• a base,
• two opposing exposed side walls, each of the opposing exposed side walls including a bottom edge that allows the opposing exposed side wall to unfold or fold at a joint edge attached to the base, and
• two opposing folding side walls, the opposing folding side walls operable to fold into recesses under at least a portion of the opposing exposed side walls in conjunction with an unfolding or folding of the opposing exposed side walls at the joint edge,
• the base and the opposing folding side walls including a mid-section fold that allows the base and folding side walls to unfold and fold at the mid-section fold, wherein folding the opposing exposed side walls causes the top of the two exposed side walls to meet at the mid-section fold in parallel;
• and
• a plurality of attachment devices that modularly couple the plurality of collapsible bins.