I have a few 20 year old nalgenes, and let me tell you, I abused the hell out of them. They were my main water bottle (also had a dromedary bag) on a cross country walkabout. Used them with Paracord to throw lead lines for everything from bear bags to climbing rope which basically meant me chucking them all over the place as a weight. Today, my 12 year old son took one to school with him.

I have never ever had one break, a lid break, and only once had the lid strap crack on one. Probably to most indestructible things I own.