Another good case from plano - Plano Field Locker Mil-Spec Tactical Long Gun Case w/Wheels, 46.38In

Very sturdy, lockable, yet light enough to haul around. (Only forgot about the wheels once - but nothing was inside). This one did not come with pluck-pull foam. So, draw around your contents, remove the middle layer, and cut using downstrokes with a serrated knife. You 3-gunners can confidently cut spaces for your rifle with scope (and flag), flagged pistol, (empty) mags, and a "few" accessories (unless you take your shotgun apart to move, get a different case for that). Although this takes up more space than a rifle bag, you'll have no worries about piling gear on and around the case.