Either. The main culprit at campsites will be the possums. They will prowl around your tent perimeter and have a go at things close to the outside/ tent body chewing tent and food source all at once or ripping a hole to get to food (or even food wrappers) stored eg. inside the pack but close to the outside of the pack and tent perimeter or in a coat pocket laid along the inner perimeter, here's a couple of samples from this summer:
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(those also included damage mentioned above, as well as the tent damage. A chewed pack lid and a rain coat pocket with a choc bar wrapper).
If the food is deep inside your pack and or well away from the tent perimeter they'll generally consider it too difficult.
You can store your pack outside but again food well away from pack outer or lid. You can store food bags in the huts..
Keeping a clean camp helps too, try not to spill anything while cooking.
At the popular side track turnoffs it's mainly Currawongs or Ravens, they will search the pack lid pockets opening zips etc and beak their way into the stuff stored near the top of the main pack looking for food, even pulling at cordlocks if they see something of interest. In a separate bag, deep inside the pack is also best here.