so when their class had driven back into the city , amid the smoke and chaos , at the first opportunity , jemima grabbed her backpack that was full of survival supplies from the trip two left over water bottles , a handful of energy bars , a sleeping bag and pillow , a first aid kit ( she was always prepared ) , and a small swiss army knife in a pink camo pattern and jumped out the van when it stopped at a set of blinking traffic lights at an intersection .