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Perfect for trail runners or weight-conscious hikers, the Osprey Hydraulics 500ml Soft Flask weighs next to nothing, is completely collapsible when empty, and provides sip-through access. The BPA-free construction is safe, easily cleaned, and surprisingly durable. A high-flow bite valve cap is included.
This durable, packable flask is compatible with the Duro/Dyna trail running series (sold separately) and can be used with other types of packs as well.
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