The Knack Expandable Sling is your new "Significant Other"! Whether it's keeping your phone safe, your keys within reach, or lip balm at hand, our Sling carries it all without complaining. The expansion option lets you throw in some makeup, or a charger, or a disposable 16 oz. water bottle. So give your pockets a rest, keep your look tight, and introduce the world to your new Significant Other!