The Aladdin MTL RTA by Kaees sports an overall diameter of 22mm, so it'll be a great match for your smaller devices, especially seeing as you won't be needing much wattage with this type of atomizer. Its external design is quite unique, and certainly matches its actual name, Aladdin. It does have a maximum e-liquid capacity of 2ml, and while it may not seem like much, you won't be plowing through e-liquid like a sub ohm tank since its designed for a MTL vape experience. Filling can be done through the top, so it's quick and easy.