Nalgene Silo Tritan Wide Mouth Water Bottle, 48oz. - Blue
The same profile as our 32oz WM so it will fit in your pack side pocket but lets you carry more water.  Like all Nalgene products it is guaranteed for life.
Features:

• Graduations
• Wide Mouth
• BPA Free
• Made in USA
• 1.5 Liters or 48 ounces