Collapsible shelf unit

A collapsible shelf unit, comprising:

• a three-sided frame, said frame having a back and opposed sides hingedly connected to said back at opposite edges of said back;
• at least one shelf, each said shelf including:
• a base panel which is hingedly connected at opposite side edges of said base panel to an adjacent side of said frame and is also hingedly connected to said back of said frame, said base panel having wing portions which are hingedly connected to a central portion of said base panel along a hinge line that extends to an adjacent corner of said frame;
• and
• at least one support panel hingedly connected at a rear edge of said support panel to a rear edge of said base panel;
• wherein each support panel can be folded downwardly relative to said base panel to expand and hold said sides of said frame in an erect position, and said support panel can be hinged upwardly against said back of said frame and said sides of said frame folded inwardly toward one another to collapse said central portion of said base panel toward said back of same frame so as to permit folding said shelf unit into a generally flat collapsed state.