An agricultural round baler comprising: • a bale chamber including a plurality of pressing elements for pressing a crop material to form a bale, said bale chamber having a rotational axis, • a feed mechanism for feeding crop material into the bale chamber, • a binding apparatus for feeding a binding material into the bale chamber during a binding operation to bind a bale in the bale chamber, said binding apparatus including an unwind station for supporting a roll of binding material in a feeding position in which a longitudinal axis of the roll is substantially parallel to the rotational axis X of the bale chamber, said unwind station enabling rotation of the roll while binding material is drawn from the roll during the binding operation, • and a support structure for supporting a spare roll of binding material in a storage position in which the spare roll is supported adjacent a side of the baler, • characterised in that the support structure includes a first support element for supporting a first end of the spare roll in the storage position and a second support element for supporting a second end of the spare roll in the storage position, • wherein the first support element is located adjacent an end of the unwind station, • and the second support element comprises a fixed support that is located adjacent the side of the baler, • wherein the first support element is configured to support the first end of the spare roll while the second end of the spare roll is lifted away from the second support element and the spare roll is moved from the storage position to a loading position in which the spare roll is substantially aligned with the unwind station, enabling the spare roll to be moved axially from the loading position to the feeding position. • a bale chamber including a plurality of pressing elements for pressing a crop material to form a bale, said bale chamber having a rotational axis, • a feed mechanism for feeding crop material into the bale chamber, • a binding apparatus for feeding a binding material into the bale chamber during a binding operation to bind a bale in the bale chamber, said binding apparatus including an unwind station for supporting a roll of binding material in a feeding position in which a longitudinal axis of the roll is substantially parallel to the rotational axis X of the bale chamber, said unwind station enabling rotation of the roll while binding material is drawn from the roll during the binding operation, • and a support structure for supporting a spare roll of binding material in a storage position in which the spare roll is supported adjacent a side of the baler, • characterised in that the support structure includes a first support element for supporting a first end of the spare roll in the storage position and a second support element for supporting a second end of the spare roll in the storage position, • wherein the first support element is located adjacent an end of the unwind station, • and the second support element comprises a fixed support that is located adjacent the side of the baler, • wherein the first support element is configured to support the first end of the spare roll while the second end of the spare roll is lifted away from the second support element and the spare roll is moved from the storage position to a loading position in which the spare roll is substantially aligned with the unwind station, enabling the spare roll to be moved axially from the loading position to the feeding position.