Hydrapak Ultraflask Soft Flask

Lighten your load and drink right from the source. We took our go-to flask and added filtration to create a system that delivers hydration without contamination. The filter light and compact screws on top so you can drink right from the flask. Or if you're carrying more water use the system to fill a bottle or reservoir.Features:- Easy To Use- Fits Running Packs And Vests- Lightweight- Packs DownFast & Safe Filtration:- The integrated filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from approximately 1,500 liters of water at a rate of >1L per minute.*Secure Grip:- A flexible and structured grip makes it easy to hold the flask while screwing and unscrewing the filter.Vest Pack Fit:- Soft material conforms to most hydration packs and larger vest pockets for a secure and stable fit.High-Flow:- Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.Large Opening:- 42mm opening lets you fill the flask easily at any water source.Compressible:- Flexible design shrinks as you drink, minimizing water movement.Included Backflush Adapter:- Plugs into filter valve and threads onto a HydraPak Stow or bottle of clean water for back flushing the filter to restore its flow rate.Specifications:- Capacity: 500 ml / 17 fl oz- Weight: 65 g / 2.3 oz- Dimensions: 240 mm x 70 mm- Material: TPU, Silicone POM, Hollow Fiber, ABSCare:- Avoid freezing filter. Freezing may ruin the hollow fiber membrane. If in freezing conditions we recommend you keep the filter in your pocket or near your body to prevent freezing.