Absolutely nothing of a foreign nature should be left in the wilderness . Even though they may be biodegradable, such items are unsightly and may take years to biodegrade in an arid mountain environment. Volunteer Rangers collectively remove pounds of used toilet paper every weekend from the Wilderness. It is your responsibility to pack out your own. Toilet paper takes months and even years to biodegrade in an arid mountain environment and is often dug up by small mammals and scattered about the forest floor.
Human waste is also responsible for the spread of Giardia in North America.
Restore the ground as closely as possible to its natural state. Glass, tin cans, and aluminum foil have no place in the backcountry . Leave them at home. Repackage all your food and beverages so that you carry no more than zip-lock bags. It is more efficient space and weight wise.