these are listed on syns online also:
Salt n Shake Crisps, 24g bag - 6.5 syns on all plans
Salt N Shake Crisps 30g bag - 8 syns on all plans
The 24g bag is 130 calories, so just divide it by 20 (to apply the 1 syn for every 20 calories) and you get 6.5 syns as shown on syns online
The 30g bag is 162 calories, so divided by 20 as in the 24g bag is 8 syns, again as shown on syns online.
But remember you can only use the dividing calories by 20, when there is NO free food allowance.
Hope that helps.