The term 'CARRIER's Load' is a phrase used to describe the amount of items that a CARRIER can carry. In this case, the crossword solutions for the term are ARMFUL (6 letters) and MAIL (4 letters). An ARMFUL is an amount of something that can be carried in one arm, while MAIL is a system of sending letters, packages, and other items from one person to another. Together, these two words can be used to describe the amount of items that a CARRIER can carry.