NEW DELHI: From next Saturday (June 30) passengers flying to the United States may not be allowed to carry more than 350 grams of a powdery substance in handbags. The US Transportation Security Administration (TSA) has enacted this rule after a failed attempt to put an improvised explosive device using powder explosives on a Gulf carrier in Australia last year. Airlines are advising US-bound flyers to put such things in check-in bags to avoid extra screening of the same and possibly being thrown if the security personnel are not sure what it is.