The Australian Government has several sources of information for travellers to help keep you safe.

https://www.facebook.com/smartraveller.gov.au

https://smartraveller.gov.au

Did you know people across the world use Facebook to connect and support each other in a crisis?

https://www.facebook.com/about/crisisresponse/

Australian flight restrictions & sizing guide

For full details, questions or if concerned check directly on the Australian Government website Australian Government - Department of Home Affairs website: 

Travelling with powders, liquids, aerosols and gels - below text updated 14th Sept 2019. 

Domestic flights

Flights within Australia are not subject to restrictions on how much powder, liquid, aerosols and gels you can carry onboard.

However, if you are travelling domestically, but departing from an international terminal (for example, Terminal 1 in Sydney or Terminal 2 in Melbourne—your boarding ticket will confirm if you are departing from an international terminal), you are subject to powder, liquid, aerosol and gel restrictions.

International flights 

Australia restricts the quantity of liquids, aerosols, gels and certain powders you can carry onboard international flights only. These restrictions do not apply to your checked-in baggage.

Leaving Australia

• transiting through Australia from another country
• travelling on the domestic leg of a flight departing from an Australian international terminal, e.g. passengers departing Sydney international airport on a flight to Melbourne.
• Restrictions on liquids, aerosols and gels also apply if you are arriving on international flights.

Powders

There is no limit on organic powders, such as food and powdered baby formula. There are quantity restrictions on the amount of inorganic powder that can be carried, such as salt, talcum powder and sand. 

Liquids, aerosols and gels

• Liquid, aerosol or gel items must be in containers of 100 millilitres (volume), 100 grams (weight) or less.
• Containers must fit into one transparent and re-sealable plastic bag like a snap-lock sandwich bag.
• The four sides of the bag's sealed area must add up to no more than 80 centimetres (e.g. 20x20 cm or 15x25 cm).

Only one bag is allowed per passenger, with exceptions for carers who may carry the bag/s for people in their care, including children.