Nalgene Wide Mouth Sustain Solo Water Bottle Brand new, in original packaging. 48 Fluid Ounces Gray bottle with blue lid. The Nalgene Wide Mouth Sustain Silo Water Bottle is a 48 oz. water bottle made of BPA-free plastic in a stylish gray color with a blue accent. It features a wide mouth design for easy filling and cleaning, making it ideal for staying hydrated during workouts, cycling adventures, or any outdoor activities. The BPA-free material ensures safety for your health, and the sleek design adds a touch of style to your hydration gear.