90ml Unflavored vape juice in a 120ml bottle.
Use a Shortfill Cap Removal Tool to easily fill the bottle
Do not add 30ml of water soluble flavor concentrate. That would create a flavored vaping product, which may violate the law in your jurisdiction.
3mg & 6mg are formulated for subohm tanks.
12mg & 24mg are formulated for pods & clearomizers.