What is “full” and what is “90% full” for trays/tubs?
Canada Post has diagrams of how to calculate the “full” definition, which is essentially 90% of the total that would physically fit into a tray. This 10% allows for variations in actual versus theoretical maximums. It is this “90%” number that you would supply to Q_MAIL as TUB=. Q_MAIL stops when it reaches the specified number you gave it as TUB=, BUT it will continue to the end of the bundle it was working on at the time, meaning that it will likely exceed the (90%) maximum specified. This will use up some of the 10% “slack”. Unless your bundle max is more than 10% of the true 100% full figure, then there will never be too much allocated to a tray. If the bundle max is more than 10% (and density is such that the current bundle contains the maximum – most times it won’t even be close), then either reduce the bundle max, or reduce the TUB= number as appropriate. So simply put, if the ABSOLUTE PHYSICAL MAXIMUM that would fit into a crammed tray is 500, then you should specify TUB=450, a
