When I saw that the new bins in Ridgid Pro Gear Organizer had slots in the top, I thought they would be perfect for supporting nesting cups like my ones for the Milwaukee Packout Organizers.
Because of the supporting nubs, these nesting cups will only work with the new Ridgid orange bins with the slots.
I originally made a cup with no dividers, but quickly abandoned that idea, because it was really hard to remove without the divider to grab onto.
Update 20190311: I added a cup with a cross divider and the fusion360 archive if you want to modify the design.
You don't have to use supports, but it gives the support nubs a cleaner bottom.