I am just getting into the carto tank world. Have been using Protanks or Vivi since I started. I was curious if there was anything that has a screw on cap for filling. Basically the top cap screws off and you can just fill it from there? I prefer pyrex as I vape many citrus flavors. I am a bit hesitant with the filling aspect of carto tanks and this would keep me in my comfort zone. Thanks all.