Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Never heard of them, but now I love them.

I had never heard of Klean Kanteen, until I read this article on LifeHacker [...]After reading it and deciding that I didn't drink as much water as I should, I ordered one and I absolutely love it. Within the past 3 weeks of having my 27 oz Indicator Red Klean Kanteen, water has become 90% of what I drink now.This sucker is incredibly durable and completely leak proof. The rubber grommet on the lid keeps the seal super tight and leak free. I've filled it up completely, turned it upside down and shaken the heck out of it and not had a single drop leak out. As an example of its durability: I've had my Klean Kanteen filled about 3/4 full and accidentally dropped it in my office and someone thought I fell down because it crashed so loud; I picked it up and it didn't have a single scratch on it. I used it to hammer a thumb tack into a door earlier this weekend and didn't leave the slightest dent on it. For 18 dollars, this is one hell of a buy.