The GrandPac was developed for the deep powder slopes of Jackson Hole, WY. That's not to say that it's limited to skiing and boarding. The GrandPac has been adopted by horseback riders, snowmobilers, rescue workers, and more.
The GrandPac is slim enough to wear under your jacket (without looking like Quasimodo), utilizing body heat to keep your water and other items from freezing, even in sub-zero temperatures. The 3D Airmesh creates a layer of insulation and ventilation, keeping you dry and warm. It can even be worn underneath a large backpack.
The chest panel contains 2 pockets with security flaps, 1 large zippered pocket(sized to fit a locator beacon or gps), 2 clear pockets(great for ID or a lift ticket), and a key ring holder. The back panel houses a 1 liter, BPA free reservoir that is ready to use straight out of the box. The high flow hose and 360 degree bite valve make it easy to take a drink. A plastic clip is also included so you can position the bite valve within easy reach. Weighs 17.4 ounces and measures 15" X 12" X 2".