Katadyn's BeFree filters revolutionised clean water on the go by eliminating tiring pumping and harsh chemicals. The hollow fibre membrane with 0.1 micron pores removes bacteria, protozoa, cysts, microplastics and sediment at up to 2 litres per minute, whilst the collapsible Hydrapak flasks pack down small when empty. Available from compact 500ml bottles that fit race vest pockets to 10L gravity systems for group camps, with the AC versions adding activated carbon filters to reduce unwanted taste from water sources. The EZ-Clean membrane simply shakes or swishes clean - no backflushing or special tools required. Built to Swiss standards and trusted by military forces and aid organisations in challenging environments, these filters deliver 1,000 litres of capacity whilst weighing as little as 192g.