Carry is a type of Continue. Continue is related to Ongoing. Ongoing is related to Repeat. Repeat is related to While. 
Weight is related to Measure. Measure is a type of Container. Package is a type of Container. you are likely to find Package in/at/on Mail. 
Carry --IsA--> Continue <--RelatedTo--> Ongoing <--RelatedTo--> Repeat <--RelatedTo--> While 
Weight <--RelatedTo--> Measure --IsA--> Container <--IsA-- Package --AtLocation--> Mail 