You can sort pick lists and invoices so that they appear in a more useful order. 

For example, you can sort by warehouse location to save some leg work in the picking process. Or you could sort them by order date to make sure the oldest orders go out first.

This is also the order in which we will send consignments to the carrier, so it will usually define the order in which the labels are printed (depending on the carrier).

Go to Settings ⇒ Carriers ⇒  (the carrier) ⇒  Settings and choose from the Sort Orders By list.