The round shape is a very common shape for stickers. Blank round stickers can be used as a kind of decoration. They can also be printed with a variety of patterns. Like smiley face stickers and ball stickers, they seem to have been designed for round stickers. As decorations, round stickers can be used to decorate notebooks, blackboards, walls, and more. As a label, it can be attached to any bag, box or bottle. It's also the perfect seal sticker. Sealing food bags, such as cookie bags, sometimes requires only a round piece of 2" sticker.