From the Bog Dog team:
The Ultra bottle is designed for performance. Features the new OMM bite large aperture bite valve for an excellent water flow rate. Allowing you to hydrate immediately without having to open or close any valves. Lids and bite valves compatible across the OMM hydration range.
Interchangeable lid & bite valve
BPA PVC and Phthalate free
Collar to reduce sloshing
Colour: Clear
Volume: 750ml
Weight: 80g