The payload consisted of three 10 cm spheres whose external appearances are identical. However, they differ in their masses. The three masses are 1 kg, 1.5 kg, and 2 kg. In their launch configuration, the three spheres are separated by a set of two spacers and two end plates. The entire assembly fits into the standard CubeSat Peapod deployment device. When deployed, all spheres, spacers, and end plates are ejected into space at relatively low velocities. Hence the initial orbit of POPACS is that of the payload from which the Peapod deployed the satellites and other hardware.
More information available at: cass.usu.edu/ou-files/POPACS-WebPage.pdf
or visit the USU POPACS website: sites.google.com/site/usupopacs/home