Same thing as out large wet bags - just a bit smaller: hold wet swimsuits or messy baby clothes. Hold makeup, passports, or money. If you want to keep it dry - put it in here. If you want it to keep other things from getting wet - put it in here. Small bags measure approx. 8 1/2" X 6 1/2". Baby Bags measure approx. 7 3/4" X 9 1/2".