A fluid-filled chamber may be incorporated into footwear and other products. The chamber is formed from a polymer material that defines a first surface, a second surface located opposite the first surface, and a sidewall surface extending around a periphery of the chamber and between the first surface and the second surface. A plurality of bonds are spaced inward from the sidewall surface and join the first surface and the second surface. The bonds may be distributed to form a regularly-spaced array, such as a hexagonal array. The first surface and the second surface may define elliptically-shaped structures between the bonds. The bonds may be formed to have a slope that is an average of slopes of the first surface and the second surface in areas proximal the bonds.