翻譯名義集 7.38

7.38

[Floating float-bag] The Mahīśāsaka Vinaya states: "From now on, I permit the bhikṣus to keep floating bags, whether of sheepskin or oxhide." Tradition reports that in the Western Regions, those who cross the sea often make bags of bird feathers, or carry large ox bladders; if an ocean ship is lost, they blow air into them to float their bodies.