You can use them to dress up even boring freeze dried food. Try some celery salt, dried onions, dried peppers, basil, or chili peppers. You don't want to carry unnecessary bulk. Remove the packaging from all your groceries. Measure food in portions needed for each meal and add all of the seasoning and other ingredients at home.
Plastic bags are the backpacker's best friend.
It's easy to practise no-trace camping when you don't carry extra packaging, and you can store away your plastic bags for the next trip. A bit of organization helps the cause. This holds down weight and gives Scouts an opportunity to plan menu, budget, shop, pack, and cook their own food on the trip. Fuel and equipment make a heavy load. Consider this when you plan.