Nathan Blizzard 2.0 2-Liter Insulated, Low-Profile Hydration Pack (Blue/Grey) Bladder pocket, drink tube, and bite valve are fully insulated with Thinsulate 2-liter hydration bladder with filter-compatible screw-top closure and bite valve Gel pocket keeps nutrition next to body heat Lightweight, breathable Wall Mesh harness with soft perimeter binding Vertically adjustable sternum strap