You probably have to bring the trash with you for a while, so ending up with a smaller empty bottle can be preferable. There aren't a lot of public trash cans.

You probably have to bring the trash with you for a while, so ending up with a smaller empty bottle can be preferable. There aren't a lot of public trash cans. (Before I realized this, I was once perplexed by where to throw out a food wrapper. I went into a restroom in the subway station and threw it out in the only receptacle I saw, which turned out to be the hand dryer. That was embarrassing.)