Combining the best of our top-loading Terrain 55L Pack with the original Sisu, this new version is the ultimate ski-mountaineering pack. The top-loading design features convenient access to the main compartment, meaning there's no more rummaging deep into the pack to find what you're looking for.Eddie Bauer First Ascent is a comprehensive collection of premium, technical outdoor products for all mountain experiences, informed by over 100 years of product development and design expertise.