The packaging of wine for shipping and transport is usually in wooden boxes, rarely in strong cardboard boxes. The international commercial quantity of boxes is 12 bottles to 0.75 liters. This amount was due to the fact that this is still comfortable to wear by one person. The wine bottles are packed lying in the box. If production quantities are given in boxes, this refers almost exclusively to boxes of 12 bottles. For longer bottle aging imaginary wines are packed in sturdy boxes of mostly spruce wood. In the specialty trade, wines that are offered in unopened boxes, are considered particularly valuable, they are labeled OHK = Original Wooden Case (English OWC = Original Wooden Case, frz. CBO = Caisse en Bois Original) provided. A box of six bottles of two different varieties or of four bottles of three different varieties is called a "split case", a box of twelve different varieties is called a "mixed case". Also common are packaging in boxes of six bottles, these are usually included standing.