The present disclosure relates to packaging of feedback information bits in a wireless communication system. Some embodiments are applicable to both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) systems, whereas other embodiments are particularly well-suited for TDD systems. In some embodiments, a method of operation of a wireless device in a cellular communications network comprises receiving, from the cellular communications network, an indication of one of a plurality of predefined sets of feedback information codebook sizes, the plurality of predefined sets of feedback information codebook sizes being disjoint subsets of a plurality of predefined feedback information codebook sizes. In some embodiments, the indication enables the wireless device to return an expected number of feedback information bits to the cellular communications network, particularly in a saturation where the wireless device misses one or more downlink assignments.