Label 228 is a type of sticker issued by the United States Postal Service, made to be used for labeling packages with a mailing address. These stickers are given out by the postal service for free, either by mail  or at the post office.
Because of the label's availability, and the relatively large blank areas within the design, it has been widely used in sticker art and graffiti more commonly known as "slaps". Unlike many other stickers and labels, label 228 is free, and can be acquired in large quantities (up to 500 at a time). It can be drawn on using many different artistic mediums, including acrylic paints and simple pencils, as well as inkjet and laser printers. They also can be applied to many surfaces very quickly, reducing the risk of being caught. Putting up stickers is considered posting bills, and holds less of a sentence than most other graffiti and criminal charges.
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- Maćrōn. "How To Get Priority Mail Labels Through The Mail (For Free)" (2010).