  The actions of packing and cracking are central to the construction of
gerrymandered district plans. The US Supreme Court opinion in Gill v. Whitford
makes clear that vote dilution arguments require showing that individual voters
have been packed or cracked. In this article we provide precise definitions of
what it means for a voter to be packed or cracked. These definitions, which
depend crucially on the existence of at least one comparator plan, are
illustrated using a simple hypothetical example. We also explore who might be
considered packed or cracked for congressional plans in Maryland and North
Carolina, and for the current state assembly plan in Wisconsin.
