Abstract: A package includes a first member and a second member. The second member and the first member define a first cavity. A periphery of the first member is joined to a periphery of the second member to define a sealed portion, such that respective perimeters of the first member and the second member cooperate to define an outer edge of the sealed portion. The second member includes a ridge at least partially circumscribing the first cavity while remaining inward of the outer edge. The ridge includes an inner wall, an outer wall, and a rim. Both the inner wall and the outer wall extend rearward from and substantially perpendicularly relative to the first member and are connected by the rim. At least a portion of the rim, over a length of the ridge, is substantially parallel to the first member.