Noun [edit]. ditty bag (plural ditty bags). 1  A small bag used to carry one's personal effects or toiletries while traveling. 2  A sailor 's small bag to hold thread, needles, tape, etc.; a housewife.oun [edit]. ditty bag (plural ditty bags). 1  A small bag used to carry one's personal effects or toiletries while traveling. 2  A sailor 's small bag to hold thread, needles, tape, etc.; a housewife.