Выражение встречается в следующем контексте:
Regarding shipments with short journey time L/C points 2) and 3) above will be amended upon mutual agreement so that 1/3 B/L travels in ship's bag.
When origin of material is Europe as declared per Clause 4 above. an EUR1 certificate in original will also travel in ship's bag.

Заранее спасибо!