"Hydrate or die" is one of the tag lines that you will always remember as you walk up that trail on a dry humid day. Water is "gold" and very precious commodity up there. Nalgene is one of my most favorite gear. It is believed to be used by the expeditions and missions and other outdoor adventure. Its main claim to fame is un-breakable and leak proof, thus saving your change of clothes inside your pack.
When I was a newbie back in the mid-90's I always ask friends to bring back the newest model or even the old reliable Blue bottles. Below are the ones we got from Mongkok Outdoor HKMTC shop. The pink one went to Mia Oliveros who generously lent us her digicam when ours was broken. The purple one went to Hannah Liwanag who lent Isay her baby carrier-- such a great help for us all.
The new model is the narrow cap but wide neck green bottle with flip up cover. Improvement on the product based on the feedback of users is what I love about this product. Narrow opening so it doesn't spill while drinking in the jeep or truck carrying you to the jump off point. Then wide enough opening for easy cleaning and refill! The strap that is the first to break is revised into the built in loop. I am not an official endorser of Nalgene mind you. But I just like them! A must have gear. Hydrate or die.