Research has established that families in developed countries commonly combine multiple sources of childcare. Yet, families’ packages of childcare and their effect on maternal labor force participation are underresearched, and the few existing empirical studies are primarily descriptive or use cross-sectional data. We add to the existing literature by theorizing and testing the relationships between family type, childcare arrangements, and mothers’ work hours using Australian panel data and panel regression models. We find that employed mothers of young children who use a mixed childcare package complete more hours of paid work than do employed mothers of young children who use other childcare packages, but the reasons for this association are different among single and partnered mothers. For single mothers the most important characteristic of mixed childcare packages appears to be their flexibility, whereas for partnered mothers mixed childcare increases employment hours by maximizing the hours of childcare available to them.