VestPac GrandPac The GrandPac is the ultimate skiing and snowboarding accessory. Worn under the jacket, H2O doesn't freeze and electronics last 10x as long. Our patented 3D Airmesh technology keeps you warm in the winter and cool in the summer while providing superior comfort and durability. Two chest centered pockets with cinch flaps for secure convienient storage Additional oversized zippered pouch for additional secure storeage space. Two clear vinyl pockets for displaying a ski pass, id, or anything else you need to have visible. Includes front, back, straps, and 1 liter hydration reservoir