Currently we have a small area we can click to open and close bags on the left side of each bag.
Clicking the actual bag opens up the option menu (rename, drop, open, close).
I propose you switch the location of those two actions. Make clicking the bag open and close it automatically, and make the left hand area (currently has a + or an X) open up the options.
I open and close my bags much more often than I rename or drop them.