Sack Ups Protector 10 Knife Holder AC. This knife holder manufactured by the experts at Sack Ups is silicone treated to prevent rust and to wick moisture away from your knives. The Sack Ups Ten Knife Silicone Sack Protector will help keep your knives in pristine condition and looking new. Specifications for Sack Ups Protector 10 Knife Holder: Manufacturer: Sack Ups Closed Length: 5 in Package Contents: Sack Ups 10 Knife Silicone Sack Protector Sack Ups AC808: Protector 10 Knife Holder