Travellers planning one bag for the journey
If you expect to eat the whole bag, its weight and per-bag calories matter more to that decision than a serving figure for a larger pack. National Rail says passengers may bring their own food.
Who is this for?
Shoppers comparing crisp styles
Popped snacks, oven-baked snacks and sliced-potato crisps come in different portion sizes. Compare both the amount you intend to eat and the figures per 100g while choosing a flavour you want.
Travellers checking dietary labels
If salt or allergens affect your choice, inspect the exact flavour’s packet as well as its calorie figure. Ingredients and precautionary allergen statements can differ between products.
What should you compare?
Start with the quantity you will actually eat, then use the per-100g figures to compare products sold in different bag sizes.
| Priority | What to check | Your needs |
|---|---|---|
| Calories in your portion | Check the individual bag’s weight, kcal per bag or serving, and servings per pack. The NHS notes that a manufacturer’s portion may differ from yours. | I plan to eat one bag on the train, so I want the calorie figure for that whole bag—not one serving from a sharing pack. |
| Comparable nutrition figures | Compare kcal per 100g when bag sizes differ. Read salt for the exact product and portion; a baked, popped or lentil description does not replace those figures. | A smaller bag might suit my journey, but I also want to understand how the products compare at the same weight. |
| Journey and dietary fit | Check the exact packet’s ingredients, allergen advice and storage instructions. Pick a bag size you intend to finish or can carry after opening. | I want a snack I can pack for the train and a label I can check before eating it. |
Common buying mistakes
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Assuming the lowest per-bag figure means the lowest-calorie recipe
Popchips UK lists Chargrilled Steak at 72 kcal per 17g serving and 426 kcal per 100g. Walkers lists Oven Baked Sea Salt at 96 kcal per typical 22g pack and 438 kcal per 100g. The bags are different sizes.
Use the whole-bag figure for the portion you will eat, and the per-100g figure to compare products at the same weight.
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Letting a product description stand in for the nutrition panel
Words such as “baked”, “lentil” and “lightly salted” describe different characteristics. Tyrrells lists 141 kcal and 0.60g salt per 30g serving of Sour Cream & Onion Lentil Crisps; neither figure establishes the contents of an unspecified whole bag.
Read energy and salt for the exact flavour and the quantity you intend to eat.
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Reading a sharing-bag serving as a whole bag
Tyrrells lists 156 kcal per 30g serving for its 150g Lightly Sea Salted bag, which it describes as containing five servings. Its separate 40g pack lists 208 kcal for the whole pack.
Check total weight and the number of servings before choosing a bag for the journey.
Brand references for comparing packets
These manufacturer figures concern the named flavours and portions; check the packet you purchase rather than applying them to a brand’s entire range.
Walkers
Its Oven Baked Sea Salt and Ready Salted products offer a direct comparison between two specified individual portions.
- Walkers lists 96 kcal per typical 22g Oven Baked Sea Salt pack and 130 kcal per 25g Ready Salted portion.
- The sizes differ: Walkers lists 438 and 518 kcal per 100g respectively. Its “50% less fat” statement for Oven Baked concerns fat, not calories.
Popchips
Two popped-snack flavours have stated figures for small portions.
- Popchips UK lists Chargrilled Steak at 72 kcal per 17g serving and Sea Salt at 99 kcal per 23g serving.
- Use the figure for the flavour and pack size you buy, rather than applying either serving figure to a sharing bag.
Tyrrells
Its potato crisps and lentil crisps illustrate why the serving and whole-pack figures need separating.
- Tyrrells lists 208 kcal for a whole 40g Lightly Sea Salted potato-crisp pack.
- Its Sour Cream & Onion Lentil Crisps list 141 kcal per 30g serving; that does not give the calories in an unspecified whole bag.
Seabrook
A crinkle-cut potato-crisp option with a stated individual-bag figure.
- Seabrook lists Sea Salted at 164 kcal per 31.8g bag and 516 kcal per 100g.
- Seabrook describes this flavour as gluten-free and suitable for vegans; check the purchased variant rather than extending that description to the full range.
Kettle Chips
A hand-cooked potato-crisp option to assess by its packet’s portion size.
- Kettle Chips lists Lightly Salted at 516 kcal and 0.7g salt per 100g.
- Use the weight and nutrition details of the particular bag to work out the portion you plan to eat.
McCoy's
A ridged potato-crisp alternative for shoppers comparing familiar crisp styles.
- McCoy's lists Original Salted at 533 kcal and 1.3g salt per 100g.
- Check the chosen bag’s weight before using those per-100g figures for a whole-bag decision.
REAL Crisps
A hand-cooked crisp range for which the exact packet remains important.
- REAL describes its range as vegetarian and gluten-free.
- Compare the nutrition and bag weight of the particular flavour when calories per journey snack matter.
Joybuy snack options
These multipacks offer individual bags of popped, oven-baked and corn snacks for packing one portion. They do not replace checking calories and other nutrition information on the exact flavour you choose.
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PopChips Sour Cream & Onion 5 × 17g
Individual 17g bags offer a defined portion to pack for the train. If you expect a larger snack, consider whether one bag is enough; check this flavour’s own nutrition and allergen label.
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PopChips Barbecue 5 × 17g
This multipack provides individual 17g bags in a barbecue flavour. Check whether that portion suits your journey and read the exact flavour’s packet for nutrition and allergens.
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Walkers Oven Baked Cheese & Onion Crisps Flavour 6 × 22g
The individual 22g bags provide a different portion size from the 17g PopChips options. Check Cheese & Onion’s own nutrition panel rather than using figures for Walkers Oven Baked Sea Salt; inspect the packet’s allergen advice too.
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Walkers Oven Baked Variety Pack Crisps 6 × 22g
This variety multipack contains individual 22g bags. Choose it if you want mixed flavours, and check the nutrition and allergen information for the particular bag you take.
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Smiths Frazzles Crispy Bacon Flavour 6 × 20g
These individual 20g bags offer a bacon-flavoured corn snack rather than a potato crisp. Compare the packet’s calorie and salt figures with the other snacks if either affects your choice.
Questions about crisps for the train
Can I bring my own crisps onto a UK train?
Yes. National Rail says passengers may bring their own food. It asks travellers not to leave wrappers behind and advises against bringing very smelly food.
Which calorie figure matters for an individual bag?
Use the kcal for the amount you expect to eat: for a whole individual bag, check its whole-bag figure or calculate from that exact bag’s weight and kcal per 100g. The NHS cautions that a manufacturer’s stated portion may differ from yours; per-100g figures also help you compare products sold in different sizes.
Does “lentil” or “baked” mean fewer calories?
Not on its own. Walkers lists 438 kcal per 100g for Oven Baked Sea Salt, while Tyrrells lists 469 kcal per 100g for Sour Cream & Onion Lentil Crisps. Compare the exact flavours and the amount you intend to eat, rather than treating either description as a nutrition rating.
What should I check if I have a food allergy?
Read the exact packet’s ingredients and precautionary statements before eating. UK government guidance says that, for prepacked foods such as packets of crisps, any of the 14 regulated allergens present as ingredients must be clearly identified in the ingredients list; a product may also carry “may contain” advice.
How should I pack crisps for the journey?
Follow the storage instructions on the particular packet and keep an individual bag sealed until you intend to eat it. A Joybuy description for Walkers Oven Baked Sea Salt calls it ready to eat and directs storage in a cool, dry place before opening.