Do you like hiking? How about any other outdoor exercise? Then you might have experienced the unfortunate feeling of running out of water just when you need it. Nalgene makes fantastic water bottles that carry enough water, and are themselves strong enough, to fuel almost any type of outdoor exercise.
For years I used to take old gatorade or pop bottle full of water with me on my runs. Most of them hold around 600ml of water and are flimsy and unreliable. Nalgene bottles could stop a bullet with their durable exterior, and they hold a whopping 1L of water. Not to mention the oversized drinking aperature which allows for a heavy flow when you're especially thirsty.
I've dropped my Nalgene bottle from about 7ft onto concrete - full of water. The thing never cracks. I love it so much that all my friends use them now and I drink out of it even when I'm sitting around the house. Buy it!