When right clicking a Package to insert a single item, the item gets placed against the package if it is a block. If you shift-right-click the package with the item, you pick up the package and insert the item at the same time. Need a blacklist entry for the Carrier mod to add in packages.

AOF3 Pack ver 2.1.2
Carrier mod ver 1.1.0
Packages mod ver 1.16.2-1.1