The UltraFlask 500 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 two cap sets: one with a removable bite valve mounted directly to the cap and one with an adjustable drink tube that can be cut to a custom length
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