| Subtype | Description |
 | A postal single is a single postal box that will be mailed to a group of people, one at a time. Only the owner of the tracker may add boxes—everyone else is just along for the ride. |
 | A postal ring is a concept where each person who joins the ring contributes a postal to be mailed in a circular fashion. Person A mails a postal to Person B who mails to Person C, and eventually returns to them from Person Z. All members of a postal ring can add boxes, but they can only add postals that have them as the listed owner. The ring leader may add postals from anyone. |
 | No subtype is the wild, wild west of postal trackers. It's not a single nor a ring, which are the most common organizations, but what it is is anyone's guess. Any participant can add postals they own, and the tracker's owner can add any postal they need to, much like a postal ring, but the organization of who mails what to whom may not follow conventional rules of rings. |
| Attribute | Description |
 | The postals in these trackers have a movie attached! Stamp into the box, then watch the movie! |
 | The postals in these trackers have music attached. Stamp into the box while listing to the CD included with it! |
 | Surely you know where this is going, right? There's a book to read with these postals. These trackers will probably move a lot slower than most if participants actually choose to read the included book. |
 | These trackers include an altered book with the postal. |
 | The postal in these trackers can be anything under the sun—whatever floats your boat, and who knows what others might do. |
 | These trackers have a theme that everyone is expected to follow. |
 | It's okay to reuse an old postal for these singles or rings. |
