Source

Widepac Insulator

<p>If you run in winter, you may not have ice-cold water in your drinking bladder, if you are out in summer, you will be happy if the water is still cool and fresh even after a few hours on the trail. That's what the Widepac Insulator Sleeve from Source is for. With its small packing size, it fits into any backpack, a fastening clip holds it to the shoulder strap of the backpack.<br></p>