Although. Some translations do have it this way, with a footnote that the bottles are actually wineskins. Still, the metaphor isn't clear in these terms. If you didn't already know, it would be natural to ask "What's wrong with new wine in old bottles, as long as they've been properly washed?"
It's like the world has a vendetta against clarity.
Then, today, Sarah Hoyt at Instapundit posts:
NEW WINE IN OLD CASKS: Mark Zuckerberg’s $100 million donation to Newark public schools failed miserably — here’s where it went wrong.
This, however, is going too far. Much too far. And Sarah hails from Europe, and all Europeans are wine experts, so there's no excuse for this!
Here's Matthew 9:17:
What does it mean? Different commentaries have different explanations, but I like the explanation that it is a reminder to keep an open mind. It's amusing to think of the brains of the close-minded bursting and dribbling out when confronted with new ideas."... Neither do people pour new wine into old wineskins. If they do, the skins will burst; the wine will run out and the wineskins will be ruined. No, they pour new wine into new wineskins, and both are preserved.”
Anyway, you probably knew this, but I had to get it out of my system. Blame Grim; he gave me posting privileges.