The Lowe Alpine Women's Altus ND50:55L Backpack provides four-season versatility overnight summer treks and hut-to-hut winter tours. It's the largest Altus that Lowe Alpine designed with a women-specific suspension system. AirContour+ features a female-fitted lumbar pad with a vertical adjustment that customizes the shoulder straps and waist belt to your specific liking. The molded back panel provides support for the long haul. Lowe Alpine also hooked this pack up with a rain cover for wet weather protection, and attachments for ice axes and trekking poles. The backpack is hydration compatible, and there are three access points to the main compartment for convenient packing and unpacking.