DHF 2.5LTPU Hydration Bladder, Tasteless BPA Free Water Reservoir Bag with Insulated Tube for Hydration Pack for Cycling, Hiking, Running, Climbing, Biking : Amazon.co.uk: Fashion
NRS Hydration Bladder Replacement Tube and Valve
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HydraFlex™ Tube for Hydration Bladders | HydraPak
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What would be causing yellow stains in my hydration pack/tubing? I've only been using water exclusively in my pack. : r/running