Packs like the shakes, oatmeal, chilli and spicy spaghetti are all around 12.5g of carbs, most bars are around 16.5g. When I was getting kicked out of ketosis every few days slim and save told me to cut out the bars and the the spaghetti Bolognaise as they could be the cause.
4 shakes would be 50g carbs
2 shakes, a spaghetti Bolognaise and a lemon bar would be over 60g
Of course there are exceptions like prailine bars which are just 10g and wafers which are 13g so it's more about the combination of packs you have in the course of a day rather than just a single pack x