Any aluminum foil that's simply labeled "aluminum foil" is considered regular aluminum foil. In addition to being thinner, it's also less expensive than heavy-duty foil: A 200-square-foot roll of Reynold's Wrap Aluminum Foil costs $9.19 on Amazon. For roughly the same price ($8.99), you'll get a 130-square-foot roll of Reynold's Wrap Heavy-Duty Aluminum Foil.
Why it is?
Regular and heavy-duty aluminum foil is made of the same material, but there's a key difference: the thickness of the foil.
Regular aluminum foil will definitely work for kitchen tasks like covering dishes to be stored in the fridge, wrapping sandwiches and other foods, and lining baking sheets. But regular foil doesn't hold up as well with heavy foods or with high-heat cooking on the grill, where it's more likely to tear, rip, or break.
Remember that heavy-duty aluminum foil can do everything that regular foil can do, but it doesn't work the other way around. You can stick with the regular stuff for basic tasks like covering or wrapping foods and lining baking sheets, but go for heavy-duty foil for grilling and freezer storage.
You might be thinking. Where this really matters is when you're using aluminum foil for cooking. Since regular aluminum foil is thinner than the heavy-duty version, it doesn't stand up to high heat and weighty items as well.
By far the most common aluminum foil used for home and commercial use. Most home users buy 75 ft. rolls of Reynolds aluminum foil or a comparable brand for home use. Heavy duty foil provides extra strength and tear resistance. Many cooks use it for baking, grilling, and storage. Most Aluminum foil rolls labeled "Heavy Duty" are between .0008 thick and .001 thick. The extra three thousandths of an inch makes a big difference for a variety of applications.