Safe & Sound 13.5 Zip-Up Case Excellent for storage of special knives you want to protect. Vinyl construction with fleece lining. Nylon zipper. Size is measured through the middle at the zipper tab." Size 13 1/2". Excellent for storage of special knives you want to protect. Vinyl construction with fleece lining. Nylon zipper. Sizes are measured through the middle at the zipper tab.