I’ve talked to TSA people in the US, the official literature and signs may say 
3 oz, but the agents know it as 3.3 fl oz or 100 ml. Ive been told a couple of 
times that my toothpaste (100 mL) is too large, whereupon I show them the 100 
mL and they say OK it’s fine!

Note that toothpaste in the USA is sold my weight not volume. Not much help 
with international travel.

Mike Payne

On 03 Jul 2014, at 16:53, Martin Vlietstra <[email protected]> wrote:

> There is a legal problem with fluid ounces in international travel. Do you 
> mean UK fluid ounces or US fluid ounces?  Once you are on an internal US 
> flight, it is quite clear that they mean US fluid ounces..
>  
> From: [email protected] [mailto:[email protected]] On Behalf Of 
> [email protected]
> Sent: 03 July 2014 16:07
> To: U.S. Metric Association
> Subject: [USMA:54087] Metric Size Limits on Airport Security Sign - BBC
>  
> My cell phone captured a couple of photographs (attached) this morning of a 
> BBC television report about increased airport security. I notice that the 
> sign displays size limits in milliliters only. I think the sign is intended 
> for people entering the United States. Perhaps the sign makers concluded that 
> ounces would only confuse most of their target audience.
> 
> David Pearl www.MetricPioneer.com 503-428-4917

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