This page tells you about the powder restrictions to be aware of before you pack.
Since 30th June 2018, there's a limit to the amount of powder you can take in your hand baggage on flights to the USA. This includes things like protein powders, talc, laundry powder and Bisto.
For security reasons, if you want to take any powder products larger than 350ml (12oz, 340g), they'll need to go in your checked baggage - you can't take them onboard with you.
If you buy any duty free powder products at the airport over the 350ml (12oz, 340g) limit, make sure they put them in a tamper proof sealed bag for you (you'll be fine with your favourite face powder from Mac, as they're only about 10g).
There are some exceptions:
For more information about what items you can or can't bring in your hand baggage, please visit our Dangerous Items page.