Refined title: HydraPak 500ml Running Water Bottles

The perfect lightweight, collapsible running flasks to keep you hydrated on your runs are the HydraPak UltraFlask Speed 500ml and HydraPak SkyFlask Speed 500ml. The UltraFlask features a soft, flexible body that conforms to hydration vest and pack pockets with a capacity of 500ml. Its collapsible design shrinks as you drink to minimize water movement. It comes with HydraPak's easy-open SpeedFill cap that flips open for quick refills and snaps closed for a leakproof seal, making aid station stops a breeze. On the other hand, the SkyFlask also has a 500ml capacity in a flexible, collapsible design but adds an adjustable hand strap and padded thumb loop so you can securely grip and carry the flask in either hand without squeezing. The sweatproof strap is adjustable to fit various hand sizes and stays in place with Velcro. The flask is ambidextrous so you can easily switch between hands and also includes the quick-refill SpeedFill cap. With the UltraFlask fitting perfectly in vest and pack pockets and the SkyFlask securely fitting in your hand, this bundle offers two great options for keeping hydrated on all your runs. The soft, 500ml HydraPak UltraFlask conforms to hydration vests and shrinks as you drink to reduce water movement with an easy-open cap for quick refills. The 500ml SkyFlask features an adjustable hand strap and thumb loop for a secure grip without squeezing, along with a cap for fast refills. The UltraFlask, made of flexible material, fits snugly in vest pockets and has a flip-open cap for easy refilling. The SkyFlask's ambidextrous design allows it to be carried in either hand and stores away when empty. The matching 500ml flasks with innovative caps allow for quick hydration and hassle-free refills.

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