A major challenge, particularly in low-income countries, is how to increase vaccine uptake in a cost-effective way, especially in difficult-to-reach rural areas. Our previous work in Sierra Leone found that bringing mobile Covid-19 vaccination teams to remote villages quickly increased vaccination rates several fold. Because transportation is the largest cost, this project will test if cost-effectiveness can be improved by bundling more vaccines in the same mobile vaccine teams. Working with the Expanded Programme on Immunization at the Sierra Leone Ministry of Health and Sanitation and their technical partner Concern Worldwide, we are testing if bringing Covid, HPV for 10- to 12-year-old girls, and routine childhood vaccinations to villages together can be effective and cost-effective, with potential for scaling. We are also testing if endorsements from high-level authorities to disseminate accurate vaccine information increases vaccine uptake in the villages.