Salomon Soft Flask with Straw, 500ml, 17 oz - Walmart.com
SoftFlask™ WMX 500ml Soft Flask | HydraPak
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