The only leakproof bike bottle. 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. 22 oz. capacity. Wt. 4 oz.