2004 Upper Deck is a 590-card set released in three series. Series One consists of a 270-card base set and was released in November, 2003. It is supplemented by the 270-card Series Two set that was released in May, and a 50-card Update set was packaged into 2005 Upper Deck Series One Hobby boxes.
Each 24-pack Series One Hobby box yielded two game used cards and a 60-card 2003 Upper Deck Update factory set. Series Two Hobby boxes also contained 24 packs, and included one of four 50-card Update sets (Vintage, Play Ball, Reflections, or SP Game Used Patch).