The Thermacell Mosquito Repeller Holster allows Thermacell users to carry and transport a Portable Repeller hands-free and hassle-free. With an internal pocket for repellent mats and an external pocket for fuel cartridges, you can always have refills handy when you need them most. It is optimized for MR300 and MR450 Portable Mosquito Repellers and is also compatible with MR150 Portable Repellers.