Each is half the area of the one before, ie A4 paper (297 mm × 210 mm) is half the size of A3 paper (297 mm × 420 mm).
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Can You Bring Your Art Portfolio on Planes?A3 and A4 art portfolios easily fit in most airlines' standard sizes for carry-on luggage and ... sheets use an insert of cloth, glassine paper, or foam to protect the artwork inside the case.
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