Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer and modeler (from time to time and some projects I could make the functional prototype too).
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years experience working on various systems/devices across multiple industries, from concept to launch.
I guess you need to redesign the sealing lip of the opening of the holder...
That is an issue indeed (if the cap is not properly sealed, the tissues will get dry and useless
Same time will be necessary to let a bit of air inside - when the temperature or atmospheric pressure changes, it is possible the container becomes difficult to open (inner suction)
You presented a sliding cap for the closure - your device has the same closure (sliding) or is a flipping cap?
For any more questions we could chat here.
Regards
Bogdan