- The UltraFlask 300 flask fits easily in most hydration vest, belt or pack pockets
- Soft material conforms to any pocket for a comfortable carrying experience
- Flexible design shrinks as you drink, reducing water movement on the run
- High-flow bite valve auto-seals after each sip, eliminating annoying drips
- Large 42mm opening lets you fill the UltraFlask easily with ice and drink mixes
- Made of ultra-durable, abrasion resistant TPU & RF welded seams for superior durability and elasticity
- Can be frozen or filled with hot water (max temp 60° C / 140° F)
- Top-rack dishwasher safe
- Safe and reliable, 100% BPA & PVC free
300 ml / 10 fl oz
32 g / 1.1 oz
85 mm / 3.35 in x 70 mm / 2.75
Thermoplastic Polyurethane; Silicone; HDPE
Frequently Asked Questions
How do I clean my UltraFlask?
All of our SoftFlasks are top-shelf dishwasher safe so they are very simple to keep clean. If you are fueling with energy gels or mixing your own nutrition mix, we recommend using a bottle brush or Bottle Bright to clean out any residue. The bite valves and tubes can easily be removed for cleaning as well. Our Cleaning Kit provides you with both a tube brush and tablet of bottle bright to soak your valves in.