UltrAspire Ultraflask 550 Hybrid Soft Bottle

• Semi-rigid hybrid construction: combines the squeezability of a soft flask with enough structure to retain its shape for easier handling and pocket reinsertion.
• 550ml capacity: slightly more fluid capacity than a standard 500ml flask.
• Stands upright: useful when filling the bottle or placing it on an aid-station table.
• Soft, curved body: designed to sit close and stable against the body.
• Highly squeezable: flexible LDPE body allows fluid to be squeezed through the valve.
• High-flow push/pull valve: simple sport-bottle-style drinking mechanism.
• Large opening: makes filling easier and provides room for adding ice.
• Food-grade LDPE: flexible bottle construction.
• BPA free.

The UltraFlask 550 is particularly useful where the structure of a conventional bottle is helpful but a softer, more body-conforming bottle is preferred. Unlike a fully collapsible soft flask, it retains enough shape to make removing and returning it to a compatible vest or waist-pack pocket easier as the bottle empties.

Hand wash the bottle. Dishwasher use is not recommended because of its highly squeezable construction.

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.