Salomon Speed 42 Soft Flask - 17 fl. oz. | REI Co-op
UltraFlask™ Speed 500 ML Soft Flask | HydraPak
Used Hydrapak SoftFlask 500 Water Bottle - 17 fl. oz. | REI Co-op
Amazon.com: HydraPak UltraFlask Speed 500ml - Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap (500 ml/17 oz),Malibu Blue : Everything Else