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Mammut's Trion Guide 45 + 7 Backpack caters to the four-seasons climber who isn't easily dissuaded from alpine activities by a few flurries. Pack up for a morning of touring, but don't put away the Trion Guide come summer; throw your sport rack in before a beefy approach and relish the hike up to the crag. With plentiful gear-carrying options, you'll never reach the base of a climb short on tech.