Abstract: A portable standing desk configured for use in at least a storage position and a first use position includes a first and second tray portion, and an end cap. The first tray portion can have a main body including a first plurality of fingers, a first plurality of landing surfaces, first hinge posts and first guide arms. The first tray portion has a first working surface and a first inside surface. The second tray portion has a main body including a second plurality of fingers, a second plurality of landing surfaces, second hinge posts and second guide arms. The second tray portion has a second working surface and a second inside surface. The first and second hinge posts couple with the second and first guide arms to form a hinge that defines a pivot axis such that the first and second tray portions are selectively rotatable relative to each other.