Soft Flasks. My quick guide to flask happiness. It's a thing. | All the Gear Nae Idea
Amazon.com: Salomon Soft Flask with Straw, 500ml, 17 oz , Blue : Everything Else
Salomon Active Handheld | Running Warehouse
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