The nalgene loop top replacement cap is a great piece of kit if you happen to lose or damage a wide mouth bottle cap this chep alternative means that you don39t have to fork out for a whole new bottle it fits to almost all branded wide mouth bottles and still gets you hydrated in the same way the replacement cap is available in blue or black so you can pick the colour most suited to your original bottle and is made from a durable polyethylene material this water bottle cap is for multi s