Strong, Strong, STRONG! Lexan makes a product so durable, you don't ever have to worry about if it will break. Ten miles into a twenty mile hike, you'll never have to ask, "Well....what do I do now that I broke my water bottle?" with Lexan.
Also, Nalgene bottles have unlimited uses in the field. Anything that needs to be kept secure and waterproof can be stuffed into a Nalgene bottle: emergency supplies, maps, cash, bugs, wet clothes, cell phone. We even used one as a bobber while fishing once, just to see if it would work.
Nalgene bottles are as tough as anything you'll find in the...