The lightweight and compact Katadyn BeFree .6L soft flask filter has taken quick and easy water filtration to the next level. Simply unscrew the cap with built-in and replaceable filter, scoop water into the soft flask, screw the cap back on, and drink. A gentle squeeze of the flask is all that is required for a steady flow. You can also use this filter to filter water into another bottle or bladder for those outings where water sources aren’t very abundant. To clean the filter simply swish the cap with filter in water. Great for runs, fastpacking adventures, backpacking, or any time you’re in the outdoors.. When empty, this flask collapses and take up virtually no space.