Sawyer Micro Squeeze SP2129 Water Filter

The Sawyer Micro Squeeze is a hollow-fibre squeeze filter with a 0.1 micron absolute pore size, tested against both bacteria and protozoa, weighing 52 g — small enough to carry as backup or primary filtration without noticeable pack weight. Rated flow is 1.5 l/min when clean, and it fits any 28 mm PCO thread, the standard on soda bottles, so it screws directly onto a CNOC Vecto or disposable bottle rather than needing a proprietary reservoir. Cleaning is by backflushing with the included syringe rather than replacing cartridges, and Sawyer rates the cartridge for up to 378,000 litres if maintained — effectively a lifetime filter as long as it is backflushed regularly and never left to freeze while wet, since any water frozen inside cracks the hollow fibres and ruins the filter. It is not freeze resistant, so in cold weather it needs to be kept warm overnight, typically inside a jacket or sleeping bag. It filters bacteria and protozoa, not viruses — standard for backcountry sources in most regions, but worth checking against your specific trip. It suits hikers wanting a light, no-pump setup for streams and lakes rather than sources with a real risk of viral contamination.