The malt toffee, choc orange, chocolate and caramel all contain around twice the carb of the normal sachets and hence two of them a day can jeopardise ketosis.
The newer Cranberry and Peanut bars contain the same amount of carb but are high in fibre so again two a day may not be good.
Most people who have multiple bars a day have bad wind and can also get the runs so really try and avoid doing it.
M.