Monolith was designed specifically with sustainability in mind. The water bottle uses multiple techniques to deliver on this promise. Monolith is made of stainless steel, a material that is not only natural and endlessly recyclable, but it also is durable and will last a lifetime if taken care of making monolith a product you will only need to buy once. If you do need to replace your Monolith due to damage, you can rest easy knowing that its mono-material body makes it incredibly simple to recycle.