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I have a prescription ointment I'd like to bring in my carry on when flying next week. While it is equivalent to 2.11 ounces it is labelled in grams.

All the TSA FAQ's note ounces and ml, not grams, so I worry that I could get flak.

Is there a chance the TSA is going to confiscate this or argue or otherwise delay me? Does anyone have experience with this?

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Do you mean this FAQ? – Relaxed Jul 3 '14 at 14:41
those are liquid ounces, not weight ounces – Kate Gregory Jul 3 '14 at 17:23

Since it's a prescription ointment, it's not subject to the 100 ml / 3.4 fluid ounces rules anyway. Have the prescription label on it and clearly readable, and make sure the name matches the name on your boarding pass and in your passport, and you're fine. (This is more than you technically need because the rules just say "medications" but why give a security officer something to argue with you about?)

(I read about a security blogger who brought two separate one-litre bottles labelled Saline Solution and with official-looking labels on them through security. According to the story when questioned why he needed two, he replied "I have two eyes" and that was good enough for them.)

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I don't know if the TSA also has weight or mass limits but the 3.4-fluid-ounce rule is a volume limit (more-or-less equivalent to 100 ml). In any case, it would seem that the container needs to be smaller than that, by volume. A mass in grams or even in ounces does not directly indicate that.

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Well the rule also applies to gels, etc. – WhyWouldYouUseMyFullName Jul 3 '14 at 15:00
@WhyWouldYouUseMyFullName Yes but still by volume, AFAIK. – Relaxed Jul 3 '14 at 15:15
I have never had any problem bringing lotions in 100 ml bottles with me. They never looked at the unit. The TSA agents are pretty good at estimating if a container is bigger than permitted. If it can fit in a 100 ml container, you are good. They don't need the measurement on the container. – Ida Jul 3 '14 at 17:30

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