2008 National Baseball Card Day cards ?
Each pack will contain 13 cards, consisting of:
5 base cards from Topps,
5 base cards from Upper Deck,
1 chase card from Topps,
1 chase card from Upper Deck,
and 1 informational card.
The exclusively-created packs from 2008 included cards featuring 
5 Base Cards (found in every pack):
Ryan Howard
David Wright
David Ortiz
Alex Rodriguez
Vladimir Guerrero
Rookie Cards (One inserted in every pack)
Joey Votto
Clay Buchholz
Dario Barton
5 Base Cards (found in every pack):
Prince Fielder
Albert Pujols
Derek Jeter
Ichiro
Ken Griffey Jr
Rookie Cards (one per pack)
Ian Kennedy
Luke Hochevar
Chin Lung Hu