What Our Gearhead® Experts Are Saying:“I take this pack on bigger days when I still want a vest-style fit but need more room. It carries surprisingly well while skinning, and the ski lasso system makes transitions way faster when things get steep or exposed.”Longer ski mountaineering days demand a pack that can keep pace from the first skin track to the final descent. When we’re stacking vert or linking technical lines, the Firn 28L Backpack from Osprey stays composed through every transition. It hugs the body on the climb, never feels cumbersome while scrambling, and stays balanced once skis are back on. This pack expands on a speed-focused design with added capacity for extra layers, rope, and alpine tools. A vest-fit harness distributes weight evenly for comfort during sustained climbs, while the snow-shedding backpanel resists buildup in changing conditions. The ambidextrous ski lasso allows skis to be stowed without removing the pack, and on-body access pockets keep skins or crampons within reach. Purpose-built features like dual axe attachments, reinforced ski loops, and a detachable helmet net make this pack a reliable partner for committing ski-mo objectives.