Hydrapak Ultraflask+ Filter Cap

UltraFlask+ filter cap that screws onto Hydrapak flasks, water bottles, and portable bottles with a 42 mm diameter. It transforms your hydration system into a simple, effective, and lightweight filtration solution.

The cap consists of several components:

• Silicone bite valve,


• 42-mm-diameter cap,


• Filter element,


• Backflush adapter.

Thanks to its filter element, you can fill your water bottle and drink filtered water right away.

The hollow-fiber filter removes common bacteria found in water, such as E. coli (99.999%), parasitic cysts (99.9999%), and microplastics (99.999%) that are 3.0 microns or larger. It provides a flow rate of more than 1 liter per minute. The filter has a service life of 1,500 liters.