You still need to have access to the above but these days for many airlines the briefcases are sometimes lighter and there's almost certainly less paperwork on the aircraft than there was even 5 years back.
Whilst you may find some of the tail number specific stuff still stored on-board in paper form (e.g. insurance certificate) many operators now have the Ops Manual and quite probably all charts carried in some form of approved PED ( iPad or similar).
So it's licence, iPad..and charger in the briefcase...