All you have to do is simply to lift and slide the top cap and then fill the tank, super easy and convenient. So how do you like this kind of design? And do you know how many Freemax sub-ohm tanks have used the child-resistant top fill design?

They are the sub-ohm tanks with the child-resistant top fill design below:
A. Freemax Fireluke 22 Metal Edition - Originally paired with Twister 30W Vape Pen Kit
B. Freemax Fireluke 22 Resin Edition - Originally paired with Maxus 50W Box Mod Kit
C. Freemax Fireluke 3 Metal Edition - Originally paired with Maxus 100W Box Mod Kit Metal Edition
D. Freemax M Pro 2 Metal Edition - Originally paired with Maxus 200W Box Mod Kit Metal Edition
For more details about Freemax sub-ohm vape tanks, please check at https://www.freemaxvape.com/tanks