UltrAspire 800ml Soft Flask with Locking Cap

• 800ml capacity: provides greater fluid capacity than a standard 500ml flask for longer gaps between refills or when additional hydration is required.
• Locking 42mm cap: twists to help prevent unwanted leaks or spills while being carried.
• 42mm wide opening: makes aid-station refilling easier and provides room for adding carbohydrate or electrolyte powder and ice.
• Soft collapsible body: compresses as fluid is consumed, helping reduce movement and sloshing.
• Slim shape: designed to slide into compatible hydration pockets despite the higher capacity.
• Silicone bite valve: provides direct drinking from the flask.
• HydraPak collaboration: developed by UltrAspire in collaboration with HydraPak.
• PVC and BPA free.

The 42mm opening accepts compatible UltrAspire 42mm hydration accessories, including the Soft Flask Straw with 42mm Cap, and is also compatible with the HydraPak 42mm Filter Cap.

Because this is a taller, higher-capacity flask, fit should be checked against the available pocket height, width and retention system rather than assuming that any pocket designed for a 500ml flask will accommodate it.

Not sure which bottle or soft flask is right for your vest and hydration setup? See our Running Bottles & Soft Flasks Guide.

For help comparing the UltrAspire range, see our UltrAspire Bottle Guide.

If you are unsure about fit, capacity or whether this product is suitable for what you need, get in touch for straightforward advice.