Slightly off topic, but somewhat relevant.... For those who don't like the cans, let me share this story.
In late 1990, right after getting out of the Air Force, I worked a 2-week IT assignment in Dallas, TX. One day, I went down the the vending room and bought a Pepsi from the machine. It had the Pepsi graphic, but no "Pepsi" text.
My supervisor at the time suggested that I not open it, in case it was part of some contest or a collector's item. So I never opened it. Once I moved back to Alabama, I left it at my parents' house and my mom put it in a kitchen cabinet.
Over time, the contents evaporated with the tab still intact. Every time I would go home, it had a little less content swishing around until it finally went bone dry. A few years ago, I contacted the public rep for Pepsi and explained the situation. He e-mailed me back and said that there was no contest at the time and it's not a collectior's item, i.e. not worth any money. He said it was apparently just a glitch at the bottling plant.
I still have it. The picture above was made a couple of years ago and there was zero content in the can.
I told the story to demonstrate that the content of cans will evaporate given enough time. As for bottles, I don't know.