Bulk wine sold in a box/bag will likely not declare vintage and often carry a large geographical region regarding sourcing grapes, will have one of the titles indicating origin of process as

You might be talking about appellation, a legally defined geographical place or indication where wine grapes are grown. Almost all decent wines have appellation printed on their labels. Even wine blends must have respective appellations of wine grapes it is made from. Many wines sold in bulk, however, are blends of red or white wines from all around the world. Therefore, most bulk wines does not have appellation and that also makes them cheap ...