What Our Gearhead(R) Experts Are Saying: "On long days when I'm chasing fresh lines, I love the balance of volume and stability this pack offers. The Sopris 45 feels lightweight even when fully loaded with avy gear, a rope, and extra layers, and the backpanel access makes grabbing essentials fast and frustration-free." When our days demand big lines and overnight missions, the Osprey Sopris 45 Pack gives us the space and stability we need without weighing us down. Built with recycled ocean-sourced nylon and finished with PFAS-free DWR, it's a pack that's tough on the mountain but easier on the planet. The LightWire frame and EVA foam backpanel keep the load stable while shedding snow so we can move fast and stay comfortable on long climbs. We count on the Sopris 45's smart organization to keep critical gear within reach. From the dedicated avalanche safety pocket to the stowaway helmet carry and rope strap, every feature is designed for technical efficiency. Whether we're skinning deep into the backcountry or linking couloirs across a ridge, the Sopris 45 stays secure, responsive, and ready for the next objective.