Thinsulate® insulation wrapped around a horizontal bottle holster plus zippered entry from either side equals the perfect pak for an hour of cross-country skiing, running, snowshoeing, or snowboarding. In extreme cold, leave both ends of the holster zipped tightly until you need to drink. In moderately cold temperatures, open either end of the holster to provide faster fluid access. Twin waistbelt pockets let you carry ski wax, snacks, or sunscreen within easy reach.