The reasoning behind the title "The Things They Carried," is directly addressed within the first chapter of the book and it is then elaborated on through each character's personal story. As we address each character's internal struggle that is carried into war, decided/ list what "burden" each character is actually facing (whether its an emotional burden, physical item, or both).
(Note, characters include: First Lieutenant Jimmy Cross, Henry Dobbins, Ted Lavender, Dave Jensen, Kiowa, Mitchell Sanders, Norma Bowker, Rat Kiley.)