A full foil baking pan typically has the following dimensions:

Length: 12-13 inches
Width: 9-10 inches
Depth: 1-2 inches

The exact dimensions can vary slightly between different brands and manufacturers, but this is the standard, commonly accepted size for a full-size aluminum foil baking pan.

To summarize the key points:

• These pans are larger than a standard 9x13 inch glass or metal baking dish
• The extra length (12-13 inches) and width (9-10 inches) provides more surface area for baking larger items
• The 1-2 inch depth allows for a good volume of food without spilling over
• They are lightweight and disposable, making them convenient for things like potlucks, parties, catering, etc.
• The foil construction promotes even heat distribution and easy food release

So in general, you can expect a full-size aluminum foil baking pan to measure around 12-13 inches long, 9-10 inches wide, and 1-2 inches deep. This standard size makes them very useful for preparing and transporting larger baked goods and dishes.