Probly the best water bottle. Extremely durable. It does get dings if you drop it on rocks, but I do too. I read someone else's review bashing klean kanteen for using low quality stainless steel because magnets will stick to these bottles and that quality stainless steel intended for contact with food and water is not magnetic. This is untrue, these are made with 18/8 stainless steel which is of the highest quality and made for contact with food and drinking water. These bottles are magnetic because the 18/8 stainless stell is cold rolled into the bottle shape which changes the physical properties and makes it magnetic. So these bottles are completely safe to drink out of. The 40oz is a little heavy when it is full, but it holds a lot of water.