Probably the most durable water bottle on the market right now. Made only of natural materials. And with the possibility to get engraved with your own text . The bottle itself is made of stainless steel and the cap is a combination of stainless steel, bamboo and silicone. It's available in 27 oz and 18 oz sizes. I hear some people being concerned about it giving a taste of metal to the water. This is not true, unless you keep the water in the bottle for a really long period of time, it stays fresh for at least 18 hours. And even then, I much prefer that slight metallic taste to the taste and toxins of a plastic bottle. The best part is you can store hot liquids without worry of toxins. And in an emergency you can even use it as a pot to boil water inside. Just make sure to keep the cap off, or it might explode. The engravings on the bottle are etched with laser to keep it paint-free and to last longer despite heavy usage. And as I mentioned you can get your own engravi...