Flour Sack Towel. This Seafood Gumbo Recipe Flour Sack Towel is a multi-purpose flour sack towel and is made of 100% prewashed cotton. It measures about 27" x 27". Lint free, long lasting, soft & durable, absorbent. The front of the towel has an crab with a recipe for Seafood Gumbo written on it.