The BeFree 1.0L is suitable for frequent use. It is lightweight (63g) and portable for on-the-go adventures. It is super light to fill. This filter removes bacteria, cysts and sediment with its pore size of 0.1 micron (0.0001 mm). The collapsible flask packs small to fit into tight spaces such as running shorts, cycling jerseys, paddling or fishing vest. The output is up too 2L/min with a total capacity of 10000L, depending on the water quality. Easy clean the EZ-Clean Membrane by simply shaking or swishing the filter in the water-in the field or at home. No backlashing or tools necessary. 100% PVC and BPA free. Gives you the freedom to drink anytime, anywhere.Katadyn Befree Filter 1.0L Features: Water source - Clear Water Group size 1 Usage - often Product type - Softflask Output 2 litres/min Effective against microorganisms Field Cleanable Length 265mm Width 65mm Height 80mm Weight 63g