Go big or go home. The largest soft flask in the HydraPak ultralight series at 20 fl. oz., the HydraPak UltraFlask 600 fits snugly in most vest pockets and shrinks as you drink to minimize sloshing.

•  Soft material conforms to any pocket, in a size that's ideal for hydration vests, belts or pack pockets
•  Large 42mm opening lets you fill the UltraFlask easily with ice and drink mixes
•  Cap with adjustable drink tube and removable bite valve allows easy sipping
•  Bite valve can be mounted directly to cap, so you can use the flask with or without the drink tube
•  Can be frozen or filled with hot water (max temp 140°F)
•  Soft plastic is 100% free of BPA and PVC