Flour Sack Kitchen Towel, 30" x 30", 100% cotton. For the past hundred years, flour sack towels have remained the cook's favorite choice for towels. Originally they were salvaged fabric from old flour or grain sacks. After flour was used, the cotton sack was bleached, washed and trimmed. Over tie it became the flour sack towel we know and love today. Flour sack towels are famous for their absorbency and softness...great for drying dishes.