Constructed of water-resistant 1050-denier nylon, the RUSH 24 Backpack is built to last. 5.11 used quality YKK® zippers throughout and their high-impact plastic clips remain stable in all temperatures. There are elastic keepers to secure the ends of all straps. Once you’ve got the pack adjusted to your size, you’ll be able to secure the ends of all straps with these elastic keepers.