The Nalgene All-Terrain Water Bottle is the smart pick, if your rides tend to include more trail than road. The Lexan? mud flap keeps drinking spout clean and is easily opened with a flip of your thumb. Wide mouth cap fits any water purification system that fits standard Nalgene? bottles. The lower portion is made of a squeezable plastic, while the top is harder for a firm grip and a leakproof seal. No plastic taste that you get from other bottles.Lexan? mud flap keeps drinking spout clean, flips open. Lower portion is squeezable plastic. Top portion is more rigid plastic for a firm grip. Leakproof. No plastic taste. 22 fl. oz. capacity. Wt. 4 oz.