Very unique Gerry removable clam shell support ruck sack. This drab green nylon bag is complimented by white seem edges, nylon cords, leather pulls and lashing and aluminum zippers. One main compartment with two side compartments. Thick brown nylon shoulder straps attached to the bag via a very large D ring at the top. A nice thick piece of riveted white leather attaches the D ring to the bag and allows the triangular clam shell support to snap into the back. Navy mesh backing stretched taut across the concave support makes for a comfortable ride and allows for the circulation of air across the back. The back support can also be removed to make for a less rigid ride. This back balloons to have quite the capacity but also works well with small loads.
Gerry was one of the original outdoor gear companies founded by Gerry Cunningham. The label on this pack is earlier as later labels move to the G triangle shape and are marked Denver Colorado. I would estimate this bag mid-1960s or before.
Main compartment measures:
18 tall x 16.5 inches across 5 inches deep (at base)
side compartments measure:
9.5 inches tall x 5.5 inches across x 2 inches deep.
weighs 1.5 pounds