This may be because you've already added the maximum luggage allowance available for each passenger. You can usually add baggage up to a maximum of 30kg per person, although this can vary by destination.
How to find out whether you can add more luggage
You can find out whether you can add more luggage on the Extras page, where you'll see the allowance that's currently included for each passenger on your booking. If extra luggage is available, you'll see a dropdown menu showing the extra amounts you can add. If the menu is empty though, you've already reached the maximum amount.
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The Department of Foreign Affairs has up-to-date advice for Irish citizens on staying safe and healthy abroad.
For more on security, local laws, health, passport and visa information see www.dfa.ie/travel/travel-advice and follow @dfatravelwise.
Northern Ireland citizens should refer to www.gov.uk/foreign-travel-advice.
More information is available by checking https://www.tuiholidays.ie/f/info/travel-aware
Keep informed of current travel health news by visiting www.hse.ie/eng/health/az
The advice can change so check regularly for updates.