Last time when I travelled, I had 10 100 ml bottles in my clear plastic bag which I got from home.

When I got to security, they said the bag was just slightly oversized even though it is within the limits. The bag was too big dimension wise and had to bin one of my liquids.

I like to pack my liquids at home as I usually take a lot. Is there a set bag size UK airports follow?

  • 1
    Not the answer to your question but I normally take a couple of free bags from the airport when I come back from a holiday, so that for the next holiday (as you do) I could pack my liquids into the bag before leaving the house.
    – kiradotee
    Oct 13, 2019 at 23:02

2 Answers 2


One liter is the limit, as all airport and most airline websites in the EU will tell you, as well as the TSA site, (although they use the American way of notation.)

10 bottles of 100 ml will take more space than one liter, even when you have very efficient square bottles that just fit the bag, as the wall of the bottle will also take some space. If you feel you really need to bring 10 bottles, make sure several (or all) are smaller than 100 ml. 75ml will likely do, but if you are only traveling for a week or two, you will likely not need even that.

Plastic bags in the UK are often sold with 'one liter' mentioned on the packaging. Only if you can not find one of those go for one where the measurements are the only indication and go for a smaller one, (not one that is slightly bigger.)
With full bags the security officers are more likely to measure the bags. They never measured my liquids bag, but with only one, or at most two, containers in, they do not do more than eyeball them. I have also used bags smaller by a huge margin and got away with that.


1 litre.

The UK has the same rules as the rest of EU and many other countries.

  • I’m talking about the bag size, not the maximum liquid content
    – Xnero
    Oct 12, 2019 at 20:54
  • 2
    The maximum bag size (well, maximum capacity) is 1 litre as stated. There is officially no maximum liquid content, other than that it must fit within the bag (and thus logically be less than 1 litre)
    – Doc
    Oct 12, 2019 at 21:18
  • @Doc This is wrong, my bag was top big dimension wise, see my answer
    – Xnero
    Oct 12, 2019 at 22:03
  • Ignoring the fact it's not BA that sets (or enforces) the requirements, the page you've linked to in your answer also states "with a total capacity of up to a litre"
    – Doc
    Oct 12, 2019 at 22:16
  • 1
    The capacity of the plastic bag must not exceed 1 litre. Any other measures, such as 20 cm × 20 cm are just suggestions.
    – Arne
    Oct 13, 2019 at 8:35

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