A package , comprising: a first member having a front surface and a rear surface , the first member being substantially planar; and a second member having an inner surface and an outer surface, the inner surface and the rear surface of the first member defining a first cavity, a periphery of the inner surface of the second member being joined to a periphery of the rear surface of the first member to define a sealed portion, and respective perimeters of the first member and the second member cooperating to define an outer edge of the sealed portion ; wherein the second member comprises a ridge at least partially circumscribing the first cavity while remaining inward of the outer edge, the ridge comprising: an inner wall ; an outer wall ; and a rim connecting at least a portion of the inner wall and outer wall , both the inner wall and the outer wall extending rearward from and substantially perpendicularly relative to the first member , wherein at least a portion of the rim , over a length of the ridge , is substantially parallel to the first member , and wherein the rear surface of the first member and the inner surface of the second member further define a second cavity , and wherein the second cavity is at least partially circumscribed by the ridge , characterized in that at least a portion of the rim , over the length of the ridge , connects a rear portion of the outer wall to a front portion of the inner wall , such that at least a portion of the inner wall of the ridge defines at least a portion of the second cavity . a first member having a front surface and a rear surface , the first member being substantially planar; and a second member having an inner surface and an outer surface, the inner surface and the rear surface of the first member defining a first cavity, a periphery of the inner surface of the second member being joined to a periphery of the rear surface of the first member to define a sealed portion, and respective perimeters of the first member and the second member cooperating to define an outer edge of the sealed portion ; wherein the second member comprises a ridge at least partially circumscribing the first cavity while remaining inward of the outer edge, the ridge comprising: an inner wall ; an outer wall ; and a rim connecting at least a portion of the inner wall and outer wall , both the inner wall and the outer wall extending rearward from and substantially perpendicularly relative to the first member , wherein at least a portion of the rim , over a length of the ridge , is substantially parallel to the first member , and wherein the rear surface of the first member and the inner surface of the second member further define a second cavity , and wherein the second cavity is at least partially circumscribed by the ridge , characterized in that at least a portion of the rim , over the length of the ridge , connects a rear portion of the outer wall to a front portion of the inner wall , such that at least a portion of the inner wall of the ridge defines at least a portion of the second cavity . an inner wall ; an outer wall ; and a rim connecting at least a portion of the inner wall and outer wall , both the inner wall and the outer wall extending rearward from and substantially perpendicularly relative to the first member , wherein at least a portion of the rim , over a length of the ridge , is substantially parallel to the first member , and wherein the rear surface of the first member and the inner surface of the second member further define a second cavity , and wherein the second cavity is at least partially circumscribed by the ridge , characterized in that at least a portion of the rim , over the length of the ridge , connects a rear portion of the outer wall to a front portion of the inner wall , such that at least a portion of the inner wall of the ridge defines at least a portion of the second cavity . <EOS>