You can save yourself tons of time by using the 1 syn = 20 calories rule on stuff like this.
All foods that have no free food allowance can be calculated in this manner.
This means sweets, chocolate, cakes, crisps (potatoes dont count for free food in snack form), soups, prepack sandwiches, jars, sauces, alcohol, drinks, desserts, dressings, pizzas, pastry products... there's a list on the SW website but that covers most of it.
So if they are 9 syns - they must be about 180 calories for the packet.
Remember though - this only counts for foods with no free food allowance. So dont try applying it to everything. You'd run out of syns in no time!!!