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. <EOS>