The invention relates to a round baler (1), having a pressing apparatus (9) for pressing agricultural crops into a bale (50) in a pressing chamber (13), and a binding unit (20), having a binding housing (21), a plurality of roll receptacles (22, 26) which are at least partially arranged in the binding housing (21) and which are each intended to rotatably receive a binding material roll (42, 43), a feed unit (30) by which binding material (44, 45) from a respective active roll receptacle (22, 26), which can be selected from the plurality of roll receptacles (22, 26), can be introduced in the direction of the pressing chamber (13), and a brake unit (35) configured to at least indirectly cooperate with a binding material roll (42, 43) so as to brake it. The number of components and the effort involved in changing between different binding materials are optimized.