The Platypus DuoLock Cap is just what you need if you loose or damage one from your DuoLock SoftBottle.

Platypus says:

Replace a lost cap for any size Platypus DuoLock SoftBottle with this simple accessory.

It's always useful to have a spare cap in case you loose or damage the one on your existing DuoLock Soft bottle.

Easy to install
DuoLock locking flip-cap keeps grit and debris away from the drinking spout, and locks to the bottle itself, providing a clean and leak-proof drinking experience
DuoLock top secures the flip-cap and spout assembly to the bottle, delivering leak-free protection.

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