All wilderness water taken out of streams or wilderness sources should be treated through either filtration, purification or boiling. Burying garbage is no longer acceptable. Park and Forest Services prohibit digging pits. Burn everything you can burn. Cans can be carried out most easily if both ends are cut out, and the cans washed or burned and then flattened.
Many backpackers use zip-lock bags to carry in food and supplies.
As you consume food, convert the bags to garbage bags for your wastepaper, toilet paper and sanitary supplies. Make sure your waste is securely stored, or even double-bagged, so it does not leak or spill onto food or clothing in your backpack. Leave your campsite cleaner than you found it. If you have the energy and initiative, carry out any other trash you find. Butane is light, clean and requires no pumping or priming to produce an instant flame and is good for summer use.