The word "twosuiter" is not usually found in the dictionary but it is often used informally to describe a person who travels with two suitcases or bags. Some synonyms that can be used instead of "twosuiter" are "double-bagger," "two-bag traveller," "two-piece packer," "duo packer," or simply "heavily packed traveler." These terms all convey the same idea that the person is carrying more than one bag or suitcase. Alternatively, one could simply say "someone traveling with multiple bags" or describe the size or weight of their luggage instead of using a specific term.