Amazon.com: FITLY Soft Flask - 8.5 oz (250 ml) - Shrink As You Drink Pocket Soft Water Bottle for Hydration Pack/Running Vest- Folding Water Bottle for Running, Hiking, Cycling - Ski Water
Amazon.com: Salomon Outlife Soft Water Bottle, 550Ml/18Oz, Clear Blue : Grocery & Gourmet Food
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 : Sports & Outdoors