Side gusseted bags are named for the gusset, or fold, on either side of the bag. The gussets expand when the package is filled with product, and the weight of the product usually holds the bag upright. This package format has two long faces, or panels, on the front and the back for product branding. The foil side gusset bag protects your product from oxygen and moisture and is the recognized format for coffee packaging today. Quad seal bags have side seals that give the package four crisp corners and two distinct panels for marketing. Quad seal bags are more stable, and have cleaner lines than standard side gusset bags.