I've been meaning to get back to this for a while. The idea kind of got pushed to the background when we found out they
might be introducing backpack limits.
The only contentious issue was that some people felt there wasn't a need for 3 compartments and only wanted 2. As many of us feel having 3 would be useful (so you don't have to recheck what you need to keep each time you are cleaning up your backpack) and this wouldn't have a negative impact on anyone, I think it is ready to be voted on.
(And as the devs have said backpacks will expand as your character develops, I think it would still be useful even if limits are introduced.)