Holly B.wrote a review of Platypus Insulator Hydration System on November 9, 2011
I got the Platypus Insulator Hydration System for my October elk hunting trip in the Big Horns of Wy. Overall, it worked well. It did get as cold as 9 degrees F a couple of mornings, causing any water left in the mouthpiece to freeze, thus blocking any water to come through until it was thawed by the camp stove. Other than that, I was pleased with the system.