From the Air NZ website...
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Carriage of Liquids, Aerosols, Pastes and Gels:
Passengers departing New Zealand on international flights must comply with security regulations relating to the carriage of liquids, gels and aerosols in the aircraft cabin.
The measures are:
All liquids, pastes, aerosols or gels such as drinks, creams, perfumes, sprays, gels, toothpaste, lip gloss and mascaras must be in individual containers not greater than 100ml in volume
All containers must be carried in a re-sealable transparent plastic bag no larger than one litre (approximately 20cm x 20cm or 8 inches x 8 inches)
Only one bag is permitted per passenger
The plastic bag must be sealed and presented separately from all other carry-on baggage at the screening point
Liquids in containers of more than 100mls can be packed in your checked in baggage.
There are exemptions for personal medications, baby products and dietary supplements in liquid, paste, aerosol or gel form.
The containers used must be brought to the airport contained in a single, transparent, re-sealable plastic bag, which itself must not exceed 1 litre in capacity (approximately 20cms x 20cms).
The contents of the plastic bag must fit comfortably and the bag sealed. Each passenger may carry only one such bag of liquids.
The bag must be presented for examination at the airport security points.
Liquids, pastes, aerosols and gels that can not be placed inside the re-sealable bag must be packed into the hold luggage and checked in.
Be aware that if travelling to the USA you may be subjected to additional secondary security screening before boarding the aircraft.
Remember that 'Liquids' includes:
All drinks, including water, beer, wine, spirits, soup, syrups
Pastes, including toothpastes
Creams, lotions, oils, perfumes, mascara etc
Gels, including hair and shower gel
Sprays and pressurized containers including shaving
Foam and spray deodorants
Any other solutions and items of similar consistency