Abstract: Disclosed are various embodiments involving assignment and use of sort bins in a materials handling facility. A manifest is generated in at least one computer system that directs a picking of items from inventory locations in a materials handling facility. Each of the items is associated with a corresponding one of a plurality of groups of items. Sort bin assignments are generated for each of the items. Each sort bin assignment specifies a corresponding one of a selected subset of a plurality of sort bins located in a sorting station of the materials handling facility. The selected subset of the sort bins is designated to coalesce together the group of items that includes the respective item for further processing. Each sort bin assignment is based at least in part on a dimension associated with the respective sort bin and at least one attribute associated with the respective item.