HAND LUGGAGE ALLOWANCE ON PLANE

GOING TO THE PERU-BOLIVIA TRIP THIS OCTOBER. IN READING THE TAUCK BOOK , THE ALLOWED HAND LUGGAGE ON THE INTERIOR FLIGHT IS LIMITED TO 8 POUNDS .
MY CARRY ON IS ALREADY 6 lbs WHEN EMPTY AND I HAVE TO CARRY MY MEDICATIONS, CAMERAS...ETC... IN IT.
HOW DO THEY EXPECT YOU TO HAVE SUCH A SMALL WEIGHT ?
ANY COMMENT IS WELCOME . THANKS
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