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Not TSA but my wife had a really hard time trying to explain the Aladin Sport to a Chinese wand-waver when flying through Hong Kong
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Half full doesn't matter, but you're allowed 3.4 oz...my gf's perfume that I forgot to check (it was in a 3.1 oz bottle, so no go)...
3-1-1 for carry-ons = 3.4 ounce (100ml) bottle or less (by volume) ; 1 quart-sized, clear, plastic, zip-top bag; 1 bag per passenger placed in screening bin. One-quart bag per person limits the total liquid volume each traveler can bring. 3.4 ounce (100ml) container size is a security measure.
On the other hand, I did walk into the x-ray machine with a microfiber cloth for cleaning my glasses in my pocket. They asked me to take it out then insisted i dangle it in my hand during the scan instead of letting me put it back in my pocket after they saw what it was.
Maybe I'm just lucky that "early-20's caucasian female" isn't very high on their list of terrorist stereotypes.
Half full doesn't matter, but you're allowed 3.4 oz
From TSA | Transportation Security Administration | 3-1-1 on Air Travel
This was an entertaining read (well in a sort of tragic kind of way ). My two favorite (non-diving related) TSA encounters involved my gf's perfume that I forgot to check (it was in a 3.1 oz bottle, so no go), over which the TSA lady made a big stink and got all po'd when I pointed out it was half empty. In the interest of not missing my plane I just handed it to her and said "Merry Christmas"...
Second wonderful encounter was last year leaving Chicago O'Hare: they didn't like all the Polish food I brought in my carry on, so they decided to scan me and pat me down. About halfway through the patdown I told the TSA "officer" that his search technique needed some work cause he was really crappy at it (I'm an LEO). He got his feelings hurt and tried yelling at me, at which point I told him to look in the side pocket of my carry on for my badge. He looked a little dumb(er) after that. I have yet to talk to a fellow cop that actually likes the TSA tools...