Abstract: The present disclosure is directed towards systems and methods for adjusting impression inventory within overlapping packages and based on impression inventory reservations. The systems and methods receive attributes of a first package and a second package to create impression inventories for the first package and the second package. Additionally, the systems and methods determine overlap between the impression inventory of the first package and the impression inventory of the second package. Moreover, upon receiving an inventory reservation request, the systems and methods adjust, based on the reservation request, the impression inventories of both the first package and the second package.