Atkins bars are NOT IP friendly. Fat and carbs are too high, and there's a ton of sugar alcohols, which aren't good, either
The Atkins Advantage shakes, though, are okay, though still high on the fat.
The carbs are within the limits, and I've used them in times of emergency.
If you can find the EAS CarbAdvantage shake...those are the best.
I agree with finding some hard boiled eggs or cut up veggies. Those would do you good, too...especially the eggs for your protein.