The final version of the documentation for Maya is still under construction. This temporary version is based on the Blender documentation, though its contents is relevant to Maya as well (both variants use the analogical UI).
Packing Functionalities
Packing functionalities of the packer are available in the Packing multi panel:
The Packing multi panel is enabled by default in every new Maya file. To learn more about multi panels read this page.
Read the following pages to learn more about particular packing functionalities: