This is the big gulp Nalgene for when you really need to pack some water. The 48 oz (1.4 L) volume is plenty for a long leg on the trail, and the gradations help you eyeball volumes while cooking in camp. The classic thin profile of this Nalgene makes it easy to stuff into a loaded pack or side pocket. Totally leak proof design and basically indestructible. For long warm days in the Gorge this is the water bottle you want.