Nalgene bottles are also nigh-on indestructible. I don't know if they still do, but at one point they had an "if you can break it, we'll replace it"-level warra

Nalgene bottles are also nigh-on indestructible. I don't know if they still do, but at one point they had an "if you can break it, we'll replace it"-level warranty). Having the layered shape would compromise the structure you get from the regular cylinder.