What were 'Bottles' Made of in Jesus' Day?

[mythociate]

I wondered that when reading the King James Version of Luke 5:37:

³⁷ And no man putteth new wine into old bottles; else the new wine will burst the bottles, and be spilled, and the bottles shall perish.

... but then I looked at the parallel versions quoting 'bottles' as "wineskins," and that's a little clearer 

[acurtsinger2]

i figure clay or some thing made from animals