The SnoBlast’s tri-zip design lets you choose between opening the top of the pack, or unzipping it down the side to instantly access all of your gear. This versatile, compact pack is perfect for carrying your lunch, shed layers, helmet and 2 liters of hydration for a full day on the slopes. Unzip the size panels, and the SnoBlast expands to offer an extra 6 liters of storage for additional gear. When you really want to load up, the external attachment points let you carry a helmet and snowshoes on the outside of the pack. The Therminator harness also keeps your insulated drinking tube zipped securely into the shoulder strap, which keeps it from freezing in cold weather.