a.light free extension pack - minimal carrying volume for additional equipment. if additional packing volume is needed on some mountain days, the a.light free backpack can be flexibly extended by 15 l via the extension system. in addition, goggles can be easily stowed without scratching in a fleece-covered goggle compartment and ice axes or poles via a hidden attachment. this allows ambitious tourers to attach significantly more material in and on the backpack.