Open all bags by left-clicking the backpack

I’m looking for a way to open all bags at once by clicking on the backpack in Classic.

I know that I can bind it to a key and there is a number of bag replacement addons, but that’s not what I’m looking for.

I want to keep the default look of having separate bags. I just want to open and close them all at once by left clicking on the backpack.

Is there an addon or perhaps a script that would allow this?

why not just go to your keybindings (open all your bags) and use for example “b” to open all your bags?

Because I’ve been opening the bags by clicking for the past 17 years and I don’t want to mess with my muscle memory now.