A baler configured to form a bale of crop material, the baler comprising: a frame; a bale chamber structure that is supported by the frame, the bale chamber structure including a plurality of walls that cooperate to define a baling chamber that extends along a longitudinal axis, the plurality of walls include a floor, a first side wall, a second side wall, and a top wall; the plurality of walls configured to shape different sides of the bale, the first side wall includes an upstream panel, a first segment panel, and a second segment panel, wherein the first segment panel is moveably attached to the frame via a first joint, wherein the first joint is a first pivot joint; and the second segment panel is arranged in a downstream direction from the first segment panel with respect to the longitudinal axis, the second segment panel being moveably attached to the frame via a second joint independent of the first segment panel, and the second joint is a second pivot joint; and wherein the first joint and the second joint are spaced apart along the longitudinal axis, wherein the frame includes a first elongate member and a second elongate member that extend along the longitudinal axis; wherein the first elongate member and the second elongate member are spaced apart in direction that is transverse to the longitudinal axis; and wherein at least one of the first joint and the second joint is attached to the first elongate member and the second elongate member, wherein the first pivot joint is configured to rotate the first segment panel about an axis of rotation; wherein the first segment panel includes an upstream end and a downstream end; and wherein the axis of rotation is proximate the upstream end, and wherein the axis of rotation extends substantially along a vertical direction. a frame; a bale chamber structure that is supported by the frame, the bale chamber structure including a plurality of walls that cooperate to define a baling chamber that extends along a longitudinal axis, the plurality of walls include a floor, a first side wall, a second side wall, and a top wall; the plurality of walls configured to shape different sides of the bale, the first side wall includes an upstream panel, a first segment panel, and a second segment panel, wherein the first segment panel is moveably attached to the frame via a first joint, wherein the first joint is a first pivot joint; and the second segment panel is arranged in a downstream direction from the first segment panel with respect to the longitudinal axis, the second segment panel being moveably attached to the frame via a second joint independent of the first segment panel, and the second joint is a second pivot joint; and wherein the first joint and the second joint are spaced apart along the longitudinal axis, wherein the frame includes a first elongate member and a second elongate member that extend along the longitudinal axis; wherein the first elongate member and the second elongate member are spaced apart in direction that is transverse to the longitudinal axis; and wherein at least one of the first joint and the second joint is attached to the first elongate member and the second elongate member, wherein the first pivot joint is configured to rotate the first segment panel about an axis of rotation; wherein the first segment panel includes an upstream end and a downstream end; and wherein the axis of rotation is proximate the upstream end, and wherein the axis of rotation extends substantially along a vertical direction.