Abstract: A horizontal package dyeing machine in which yarn packages are supported in carriers that have a base with tubular posts projecting therefrom for stacking yarn packages thereon and a wall secured to and extending upwardly from the periphery of the base to form an enclosure for confining treating liquid. The base is formed with two liquid distribution chambers, one being an upper chamber communicating with the interior of the posts and the other being a lower chamber communicating with the interior of the enclosure. The distribution chambers have open ends that can communicate with liquid supplying and withdrawing ducts of the machine for circulation of treating liquid within the carrier enclosure. The carriers are dimensioned for positioning two carriers in a vessel with the open ends of the distribution chambers in communication for flow of treating liquid therebetween.