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vintage 1970's Sierra Designs Daypack / backpack. Features a unique modification - not sure if this is a factory modification or done by the original owner - the top of the shoulder straps have been attached to the bag through a grommet and secured by a quick release pin. This provides some swing to the shoulder straps helping the pack fit more comfortably.Zippers aree smooth, no rips or tears. GREAT PATINA.