The BeFree 1.0L is suitable for occasional use. It is lightweight (63g) and portable for on-the-go adventures.  It is superlight 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 to 2L/min. with a total capacity of 1000L, depending on the water quality. Easily clean the EZ-Clean Membrane by simply shaking or swishing the filter in the water - in the field or at home. No back flushing or tools are necessary. 100% PVC and BPA free. Gives you the freedom to drink anytime, anywhere.