There is disclosed an improved stacker, method of stacking sheets such as tags, and a stack of sheets. The stacker and the stacking method produces a stack of sheets, wherein same-size sheets are stacked so that the endmost sheet or sheets in one batch are offset or staggered to provide batch separators in a stack of sheets. The stacker includes an improved sheet feed mechanism that enables sheets having different characteristics to be fed without disassembling any portion of the mechanism or the stacker.