I found these really great BPA-free, freezable reusable bottles at Ben Franklin tonight, for $7.99 (0n sale, $9.99 regular price). They're only 0.5 L so they are easy to carry around. Yeah, it's plastic but I figure that it's a great thing to carry on my off-island jaunts because they fold flat. I've been taking my Sigg aluminum bottles with me but they can be bulky, especially when space is a serious consideration on flights. They stand on their own and are made in the US and seem pretty durable.