Luke 5:2-3

The bottles referred to here were actually containers made from the hides of animals. When these wineskins were new, they were pliable and somewhat elastic. But when they became old, they were stiff and inflexible. If new wine was placed in old skins, the fermenting action of the wine would build up too much pressure for the old wineskins to accommodate, and they would burst.

Here in Luke 5:1-39, Jesus uses this to illustrate the clash...

Luke 5:1-11

The scene of this lesson is the Lake of Gennesaret. "Although God has created seven seas," said the rabbis, "yet He has chosen this one as His special delight." No body of water on the earth is so sacred to the hearts of Christians, as this little inland sea. Along its shores Jesus walked, wrought, and talked. At that time its shore was a garden, without break, covered with pleasant towns and villages. Desolation now reigns...