For one snack, start with the weight on the bag rather than assuming every single bag is an individual-sized portion: the options discussed here range from 25g examples to larger 100g bags. Then compare nutrition for the amount you expect to eat and check the ingredients and allergen information for the exact flavour; pack size and seasoning can both change the choice.
If the bag is for eating on its own, check its weight before picking it up. Tesco lists a 32.5g Walkers Salt & Vinegar grab bag, while Tyrrells lists a 40g Lightly Sea Salted format; neither size describes every bag from those brands.
The amount in the whole bag matters if you plan to eat it all. Walkers lists 0.17g salt per 25g pack of Lightly Salted crisps, whereas Seabrook lists 0.8g per 31.8g bag of Sea Salt & Vinegar. These are different products and pack sizes, so check the figures on the flavour in hand.
Read the declaration for the exact flavour. Seabrook describes its Sea Salted crisps as gluten-free and suitable for vegans, but Tyrrells says its Lightly Sea Salted crisps may contain milk. A claim on one product cannot be carried across a brand’s range.
Choose the pack size for the occasion, then compare the label details that matter to you. Flavour and crisp style come after any ingredient or allergen checks you need to make.
| Priority | What to check | Your needs |
|---|---|---|
| Bag size | Read the net weight and any stated serving size. Individual-format examples include 25g Seabrook bags, a 32.5g Walkers grab bag and a 40g Tyrrells format; sharing formats can be much larger. | I’m buying one snack, so I want to know how much is in this particular bag rather than relying on the words ‘grab bag’. |
| Salt and energy | Compare values per bag when supplied. If a label gives only per-100g values, account for the bag weight before comparing the amount you would eat; use per-100g figures for a like-for-like comparison. | A flavour or a larger bag could change the total I eat. I want the figures for my chosen pack, not just a figure for 100g. |
| Ingredients and allergens | Check the exact flavour’s ingredients, allergen emphasis, ‘may contain’ statement and any vegan or gluten-free declaration. Walkers says its Salt & Vinegar crisps may contain milk, soya, mustard, wheat and other gluten-containing cereals. | If I need to avoid an ingredient, another flavour’s label or a general impression of the brand will not answer my question. |
| Style and seasoning | Look for the named crisp style and flavour rather than assuming they taste alike. Tyrrells describes Lightly Sea Salted as hand-cooked, while McCoy’s identifies its core crisp as ridged; neither description establishes a measured texture comparison. | Some days I want a lightly seasoned potato crisp; on others, a ridged or differently flavoured option sounds more appealing. |
Flavours within a brand can differ. McCoy’s lists milk ingredients in Flame Grilled Steak, and REAL Hand Cooked Crisps lists lactose (milk) in Ham & English Mustard.
Read the ingredients and any ‘may contain’ statement on the exact bag, even if another flavour meets your requirements.
A per-100g figure is useful for comparing products on the same basis, but it does not by itself tell you the amount in a 25g, 35g or 40g bag.
For a whole-bag snack, look for per-bag energy and salt values and check the net weight alongside them.
The same product line can have quite different formats: Tyrrells lists Lightly Sea Salted in 40g and 150g sizes.
Check the weight and stated servings before choosing a pack for one person.
Walkers says its Lightly Salted crisps have 45% less salt than the average salt value of regular potato crisps and lists 0.17g salt per 25g pack. That comparison does not describe every flavour or pack size.
Use the claim as a prompt to compare the actual per-pack salt value and check the exact product’s ingredients.
These examples show why the exact flavour and format matter; a brand reference does not mean every product in its range has the same label or comes as a grab bag.
Tesco lists Walkers Salt & Vinegar as a 32.5g grab bag. Walkers also has a separate Lightly Salted product.
Tyrrells lists its hand-cooked Lightly Sea Salted crisps in 40g, 150g and 600g formats.
KETTLE describes its Lightly Salted crisps as hand-cooked using British potatoes.
Seabrook provides per-bag nutrition for individual-format flavours, including 31.8g Sea Salted and Sea Salt & Vinegar bags.
McCoy’s describes its core crisp as ridged, a style to consider if cut and seasoning are part of your choice.
Tesco lists 35g REAL Sea Salt and Salt & Vinegar crisp bags.
These Joybuy options are single bags of potato crisps and crisp-style taro or cassava snacks. At 50g to 100g, they are larger than the 25g to 40g examples discussed above; choose by the weight you want to buy, and note the different ingredients used for the non-potato options.
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A 60g potato-crisp bag if you want salted egg yolk flavour. It is larger than the 25g to 40g examples above, so check the pack’s nutrition and ingredients for the amount you intend to eat.
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A 55g potato-crisp bag with cheese pizza flavour. Check the exact pack’s ingredient and allergen information if the seasoning affects your choice, and compare nutrition for the whole bag if you plan to eat it all.
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This 50g bag is made from taro rather than potato, so it is an alternative to a potato-crisp grab bag, not the same product type. Check the pack’s ingredients and nutrition for the exact flavour.
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A 75g cassava-chip bag for someone considering a non-potato snack. Its weight is substantially different from the smaller grab-bag examples, so check the pack size and nutrition against what you intend to eat.
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This is a 100g potato-crisp bag with teriyaki flavour, rather than a smaller individual-format example. If you want one snack, consider the full bag weight and read the seasoning ingredients and allergen information before choosing it.
Choose a weight that matches how much you intend to eat. Individual-format examples include Seabrook’s 25g bag, Tesco’s 32.5g Walkers grab bag and Tyrrells’ listed 40g format; check the actual weight because the same range may also have sharing packs.
If you expect to eat the whole bag, compare per-bag values where the label supplies them. Per-100g figures put differently sized products on the same comparison basis, but you still need the bag weight to understand the amount in your chosen pack.
No. Check the exact product’s ingredients and precautionary allergen statement as well as its dietary declarations. For example, Tyrrells says Lightly Sea Salted may contain milk, while McCoy’s lists barley in Salt & Malt Vinegar flavour.