First Class Flat Tray vs. Bundle Based
First Class Flat Mailings can be prepared either Tray Based or Bundle Based
To do a Tray Based First Class Flat mailing, set the Tray Minimum in the Container Setup area of the Presort Setup screen to EXACTLY 90. The 90 value triggers the Tray Based option and turns it ON in AccuZIP6 5.0
To do a Bundle-Based First Class Flat Mailing, set the Tray Minimum in the Container Setup area of the Presort Setup screen to something OTHER THAN 90 such as 91.