Platypus Hyperflow Cap The HyperFlow cap adds fast, hassle-free access to your water, making it easier than ever to stay hydrated throughout your day. Just bite and drink! The HyperFlow bite valve cleans easily, and a simple twist of the stem assures leak-free hydration on-the-go, adding convenience to a long list of reasons why you"ll love this cap. Compatible with all Platypus Soft Bottles, PlatyPlus Bottles and Hoser reservoirs. Weight .46 oz / 13.2 g Cap material PP/HDPE Bite valve cover material Silicone