Primary Packaging
Primary packaging is commonly what comes to mind when people think of packaging. Whether that is the aluminum can a beverage was purchased in, the candy bar wrapper, the bag those pretzels came in, or that bottle of wine, primary packaging has direct contact with the product and usually sold in individual units.
Secondary Packaging
Secondary packaging is what the individual primary packaged goods are shipped in and used to display the items. An example of this is single candy bars packed in a larger branded case that can be placed at the checkout counter.
Tertiary Packaging
Tertiary packaging is meant to keep bulk products from being damaged during transportation. Normal tertiary packaging includes shipping crates & boxes, pallets, reels/spools, and shrink wrap.