The Enwild Difference
A soft-sided 17-ounce flask that is ideal for use in running vest pockets, the HydraPak UltraFlask 500 ML weighs less than 2 ounces and has a high-flow, self-sealing bite valve.
A cut above lesser soft flasks, the UltraFlask is made of highly durable TPU and utilizes RF-welded seams to ensure leakproof performance. It is both BPA-free and PVC-free.
The flask has a wide 42mm opening that makes for easy refilling and cleaning and lets you add ice. You can customize your cap by choosing a direct mount of the bite valve or by using the included extended drinking straw.
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