Nalgene's Wide Mouth Sustain is a proven Nalgene classic, with the wide neck contributing to the bottle's practicality for easy rinsing or filling. It is also growing in popularity because it is made from recycled plastic. The design looks simple but is backed by over 50 years of manufacturing experience. The lenses help you keep track of your drinking regime or make it easier to mix a drink (such as isotonic). 50% recycled plastic. Shock resistant. Suitable for cold and hot drinks. Does not retain odour. OTF screw cap with wire lock.