For one drink with airport food, a sealed 150ml mixer gives you a smaller portion than opening a large bottle, but its size does not guarantee that you can take it through security. Heathrow states that liquid containers of up to 2 litres can stay in cabin baggage, whereas Gatwick’s published guidance sets a 100ml maximum; check your departure airport’s rules before packing a mixer or plan to buy one after security.
A small-looking bottle may still be too large for your departure airport’s liquid rule. Heathrow states an allowance of up to 2 litres per container in cabin baggage, while Gatwick’s published guidance specifies a 100ml maximum.
A 150ml can or bottle avoids opening a larger mixer for one occasion. Tesco lists Fever-Tree and Schweppes tonic multipacks in this size; check airport retailers separately if you intend to buy after security.
If you are choosing between regular, light and slimline tonic, compare the exact products’ ingredients and nutrition information per 100ml. The variant name alone does not tell you its sugar content.
Decide where you will obtain the mixer before settling on a portion size: a container for your cabin bag has to meet your airport’s rules, while an after-security purchase depends on what is stocked there.
| Priority | What to check | Your needs |
|---|---|---|
| Container size | Check the departure airport’s liquid-container limit and any transfer rules before packing. Heathrow states up to 2 litres in cabin baggage; Gatwick’s published guidance specifies no more than 100ml. | I want to take a mixer through security without choosing a container that exceeds my airport’s limit. |
| Portion | Check the volume of each can or bottle, not just the multipack size. Sainsbury’s gives 150ml mixer with 50ml spirit as a serving suggestion for its listed Fever-Tree tonic; Fentimans describes a 200ml mixer format. | One smaller, sealed mixer suits my single food or drink occasion better than opening a large bottle. |
| Nutrition | Compare energy and sugars per 100ml on the exact variant’s label, alongside its ingredients. Do not read “light” as “sugar-free”. | If I choose a lighter tonic, I want to know what its label actually says rather than relying on the name. |
| Flavour | Decide whether you want Indian tonic, a flavoured tonic or ginger ale. Check the product name and ingredients for the particular variant. | I may prefer a straightforward tonic with one drink, but want a different flavour with another. |
A 150ml or 200ml container exceeds the 100ml maximum in Gatwick’s published guidance, even if it is sold as an individual serving. Heathrow states a different cabin-baggage allowance.
Check the rules for your departure and transfer airports. Where a 100ml maximum applies, choose a container within that limit or obtain your mixer after security.
Sainsbury’s 1L own-label tonic is labelled as four servings and says to refrigerate it after opening and use it within three days.
If you need only one portion, compare individual container sizes before choosing a multipack or a large bottle.
Light and slimline are different product descriptions; neither replaces the nutrition panel for the exact tonic you are buying.
Compare sugars and energy per 100ml, and read the ingredients if sweeteners matter to your choice.
A supermarket listing establishes a pack format, not what a particular airport shop or restaurant carries.
If you need a specific mixer after security, check the relevant airport retailer’s current selection before relying on it.
These product and retailer references help distinguish formats; they do not indicate what is stocked at an airport.
Tesco and Sainsbury’s list Fever-Tree tonic in 150ml multipacks, including Premium Indian and a light variant.
Tesco lists Schweppes Tonic Water and Slimline Tonic Water in 12 × 150ml multipacks.
Fentimans describes a move from its former 125ml mixer range to a 200ml format and also lists Pink Grapefruit Tonic Water.
Britvic’s September 2023 announcement describes classic and zero-sugar Indian Tonic Water in 330ml cans.
Tesco’s tonic listings include 150ml Fever-Tree and Schweppes multipacks.
Sainsbury’s lists a 150ml Fever-Tree light tonic multipack and a separate 1L own-label Indian Tonic Water.
These are 150ml tonic and ginger ale options for choosing an individual mixer portion. Check your airport’s rules before taking any of them through security; a product listing does not establish airside stock.
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For a single tonic portion, this pack contains 15 individual 150ml units. Check the exact variant’s nutrition label if you are comparing it with another tonic; a 150ml container exceeds Gatwick’s published 100ml maximum.
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This pack offers individual 150ml slimline tonic portions. Read the current ingredients and nutrition panel if these affect your choice, and check the departure airport’s limit before packing a container.
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An eight-pack of individual 150ml Indian tonic portions suits choosing one container for an occasion rather than opening a larger bottle. Confirm your airport’s liquid rule before putting one in cabin baggage.
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Choose this 150ml ginger ale portion if you want a ginger-flavoured mixer rather than tonic. Check the exact product label for ingredients and the departure airport’s rule before packing it.
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This 12-pack provides individual 150ml Indian tonic portions for occasions when you do not want to open a larger bottle. Compare its current label with the Slimline variant if ingredients or nutrition matter, and check security rules before travel.
It depends on the departure airport. Gatwick’s guidance published on 17 April 2025 says liquids must be in containers no larger than 100ml, so a 150ml mixer exceeds that limit; Heathrow states that containers up to 2 litres can stay in cabin baggage. GOV.UK advises checking with your airport before travel because rules have changed at some UK airports.
A 200ml container exceeds Gatwick’s published 100ml maximum. Fentimans describes its mixer format as 200ml, while Heathrow states a cabin-baggage allowance of up to 2 litres per container; confirm the rules at your departure and any transfer airport.
If your departure airport applies a 100ml maximum and you want a 150ml mixer, buying after security avoids taking that container through the initial checkpoint. Check what your terminal sells and any rules affecting onward travel or transfers before relying on that plan.
No: “light” alone does not establish a tonic’s sugar content. Read the nutrition panel and ingredients for the exact variant, comparing figures per 100ml if you are choosing between products.
A 150ml container is the smaller portion if you need only one mixer. Sainsbury’s labels its 1L own-brand tonic as four servings and instructs customers to refrigerate it after opening and use it within three days, so consider whether you will use the remainder.