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Powder To Be Banned On International Flights Following Foiled Terror Plot

But don't worry -- protein powder and cremated remains are still allowed.

A foiled terror plot in Sydney has led to sweeping changes in banned substances on international flights, namely powder.

Under new restrictions, powdered items like salt scrubs, powdered deodorant, foot powders and even sand will only be allowed to fly in your checked luggage.

Organic powders, such as baby formula, powdered food, protein powder and coffee will still be allowed.

Medicines and medical items are exempt from the new restrictions- provided they come with proof such as a doctor's letter, as are cremated human remains.

Some items, such as snow globes or souvenirs with sand in them, have been flagged on the Travel Secure website as restricted items that may not be obvious.

Examples of which powders are restricted and which are not. Photo: Department of Infrastructure and Regional Development.

"If you are unsure if an item will pass screening, pack it in your checked baggage," reads the website.

Inorganic powers, which the Australian government defines as being a powder "not consisting of, or derived from, living matter", must be in containers of 350 milliliters (volume), 350 grams (weight) or less.

Even if the total amount of powder meets the restrictions, the item will not be allowed through if the container is larger than 350 milliliters.

It means that most makeups and cosmetics will still be allowed on, although you might want to pack that giant bottle of talcum powder in your checked luggage.

The new rules apply to all international flights, as well as domestic flights departing from an international terminal. They reportedly come into affect on July 30.

It comes as similar changes to security laws hit the United States, with the Transportation Security Administration banning powders of more than 12 ounces (about 355 milliliters) on international flights bound for the U.S. from June 30.

The rules were brought in following the failed alleged terror plot in Sydney last year, an airline official confirmed to CNN.

Two brothers are alleged to have been planning to target an Etihad flight from Sydney to Abu Dhabi on July 15 last year, under instruction from Islamic State.

Police alleged that Khaled Khayat, 49, and Mahmoud Khayat, 32, tried to undergo two separate plans: one to get an improvised explosive device (IED) on the plane, and another to detonate a "rotten egg bomb" on a Sydney bus The "rotten egg bomb" is otherwise known as hydrogen sulfide, a highly toxic and often fatal chemical.

Both brothers pleaded not guilty in the Sydney Supreme Court in May this year, and are due to stand trial in March 2019.