Hydrapak Ultraflask 600

The 600ml Ultraflask is a collapsible sport bottle with a versatile bite valve. Perfect for runners as it's clean, compact and easy to use.  

Hydrapak says:

Go big. The largest of our ultra-light series, the UltraFlask 600 holds more so you can go the distance. Its soft material allows it to fit snugly in most vest pockets and it shrinks as you drink to minimize water movement.

Hydrapak's 600ml Ultraflask is perfect for use with running vests and packs. The long tube allows you to access your drink without removing the flask when used in chest/shoulder straps.

The bite valve can also be used without the tube and mounted straight on to the cap for hand held use.

Not only does the flask collapse for storage, it actually collapses as you drink, preventing that annoying sloshing when your on the move.

- Reviewed by Ultralight Outdoor Gear

Read reviews here:

Help and advice:

• The UltraFlask 600 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
• Includes removable/adjustable drink tube; cut to a custom length or mount bite valve directly to cap
• 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

• Capacity: 600ml / 20 fl oz
• Weight: 43g / 1.5 oz
• Dimensions: 165 mm / 6.5 in x 70 mm / 2.75
• Material: Thermoplastic Polyurethane; Silicone; HDPE