It is strongly recommended that you pack lightly.
- Luggage in Japan
https://www.japan-guide.com/e/e2274.htmlAt least two lower cost bus services
now connect Tokyo and NRT.
: The Access Narita
: The Tokyo Shuttle
My understanding is:
you can take into the bus
a baby stroller which is compact and can be locked
to be put at your feet while you have a seat,
one or a few baggage piece(s)
which is/are enough light, small and stable
to be put on the baggage rack above the seats,
and one baggage piece
which is within the limitation
to be stored in the shared trunk room.
When you have
a baby stroller which cannot be put at your feet
or a luggage piece which cannot be put
at your feet or on the baggage rack,
you need to have it stored in the trunk room,
so you cannot share the trunk room furthermore.
----
You say in your other thread that you will
fly into Haneda Airport [HND]
and fly out from Narita Airport [NRT],
which means that you will
go from Tokyo to NRT,
not from NRT to Tokyo as in the title of your first post here in this thread.
https://www.japan-guide.com/forum/quereadisplay.html?0+169195Currently you have not yet decided where you stay overnight,
so it cannot be judged which bus service is more suitable,
even whether bus is the best transportation mode for your case.
