A modular organizer is capable of attachment to a rod of a playpen or crib, and includes first and second storage members that are connected removably to each other. Each of the first and second storage members is attached to the rod by a positioning element. Preferably, one or more third storage members are disposed between and connected removably to the first and second storage members. The third storage members can be interconnected removably to one another and to the first and second storage members.