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The UltrAspire collapsible SoftFlask carries 300mL of fluid. The unique wider / flatter wedge shape allows the SoftFlask to slide easily in and out of a hydration pocket of any modern hydration pack. Comes with a regular diameter 28mm top that features a silicone sheath bite valve.
Soft material conforms to your hand to provide 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 and includes a twist locking cap for added security
28mm opening makes it a low-profile storage option
Made of ultra-durable, abrasion resistant TPU (Thermoplastic Polyurethane) Silicone, HTPE & RF welded seams for superior durability and elasticity
Wide working temperature range (can be frozen - max temp 60° C)
Safe and reliable, 100% BPA & PVC free
Weight 30g
Capacity 300mL
Made for UltrAspire by Hydrapak
Also available in 500mL and 800mL capacity.
As at 1st Feb 2026:
We are currently expecting normal order processing times of one to two days from ordering to shipping.
Orders for the moment, are being processed and shipped within one to four working days of being received. Our expected order delivery schedule is...
