A 1.5-liter vaccine carrier box is a vital component of the cold chain management system for vaccines, particularly crucial in remote areas or during outreach immunization programs. Its primary function is to maintain vaccines at their required temperature range, typically between +2°C and +8°C, for extended periods during transport from storage facilities to vaccination sites. The 1.5-liter capacity makes it suitable for carrying a limited but sufficient quantity of vaccine vials for a specific session or smaller patient group. These carriers are constructed with high-quality insulation materials, such as polyurethane foam, and are designed to be robust and durable to withstand challenging field conditions. They are typically used in conjunction with ice packs or gel packs to maintain the internal temperature. The design often includes a secure lid with a locking mechanism to prevent accidental opening and ensure temperature stability. Regular monitoring of the internal temperature, often with a dedicated thermometer, is essential to confirm that vaccines remain viable. The proper use of a vaccine carrier box is paramount to preventing vaccine spoilage and ensuring vaccine efficacy, ultimately contributing to successful immunization campaigns and public health outcomes by delivering potent vaccines to the population.