Bagstra - The improved design Salomon soft flask manufactured by Hydrapak are flexible. You can compress the bottle as you drink to eliminate water bouncing/sloshing inside and reduce sucking effort. Easy to
Salomon (Hydrapak) Soft Flasks | runbikerace
Amazon.com : Salomon Standard Insulated Soft Flask, Battleship Grey, 400ml/13 oz Insulated-42mm : Sports & Outdoors