Since posting this, I have learned that Federal Lands have had a no possession policy for some time. I couldn't discern exactly how long, but multiple years.
What that policy said was that no open containers may be within the reach of any driver or passenger or seat.
Why the authors of SB742 added the language to the bill that has now been signed, but not totally implemented, is to make a level playing field across all public lands, USFS / BLM / State Parks / SVRA / and some even may think it could extend to private lands.
USFS has told me that if we are to pick up empty containers like we always do on every trip, they should not be placed into the vehicle, but instead in a bag off the back of the rig, OUT OF REACH of all passengers and the driver. I've also been told that LEO is smart enough to know if it is garbage or not, but lets make sure and not test their abilities. ;-) Hang it out of reach!
Ken