Katadyn BeFree 1.0L Lightweight and compact water filter This BeFree is a high-performance water filter set with a soft flask. The appeal of this compact water filter lies in its processing capacity and fast filtration speed. Unlike other portable water filters that require considerable force to filter water, this one allows you to filter water quickly just by lightly squeezing the body. This lack of stress is why it's so popular. Used 3 times. This is a used item, so please consider this before purchasing.