POSSIBLES _ Belongings, accoutrements, especially camping gear. Borrowed from Spanish (where posibles has a similar meaning), it is primarily a term of the mountain men, who carried their possibles in a possible sack, described by Lt. George Frederick Ruxton as a “wallet of dressed buffalo skin” for carrying “ammunition, a few pounds of tobacco, dressed deerskins for moccasins, &c.”

– Dictionary of the American West by Winfred Blevins.