It looks like the thread has gotten derailed a bit.
Here are some ideas off the top of my head. Most probably require some sort of insulated bag or box to keep the food fresh.
Vegetables like carrots, celery, broccoli, sugar snap peas. I don't know if you could make some kind of dip for the veggies, because I don't know if dip goes against the spirit of Whole30 or if good dip can be made with Whole30 compliant foods.
Jerky/pemmican (you'd probably have to make it yourself; I don't know of any Whole30 compliant jerky or pemmican). Also it could be crunchy or not, depending on how dried out it is.
You could take a salad perhaps? Eat parts of it as there is time.
Boiled eggs. Not crunchy, but would keep you more filled than veggies, alone.
In Nom Nom Paleo (or some such title; it's a cookbook), there is a recipe in which you essentially make omelettes in a muffin tin. You could do something like that. Again, it isn't crunchy, but it would have enough nutrition to get you through the day.
Wishing you the best of luck with your classes, and success with finding something good to eat during your school day.