One leaked
In the pack of 2 that we bought (blue and green), on the first camping trip of the season, the blue one started leaking. We found out by waking up to a big wet spot at the foot of the air mattress (where we keep our hot water bottles), when it was 40 degrees outside. We did not use going water (we let the water cool for about 2 mins after boiling) before adding it to the bottle which we filled about half way, and closed the lid tightly. The green one worked great though. We tested the blue one again the next day by adding water the same as before, and laid it on a towel, and by the afternoon the towel was very wet. The leak came from the side or bottom seam of the bottle, not the lid. I did not contact customer service about it, but wanted this to be known.
Rating: 3 stars