We have used a lot of water filters over the years.  The Sawyer is compact, simple and versatile.  The Sawyer's Squeeze Water Filter is Rated to 0.1-micron absolute filtration, removes 99.99999% of bacteria such as salmonella, cholera, leptospirosis, and e. Coli, along with 99. 9999% of protozoa such as giardia and cryptosporidium.  All from independent testing laboratory Hydration, LLC.; microbiological report S05-03. The Squeeze Filter also filters out 100% of microplastics. 

Included

• Squeeze Filter
• 2 x 1L pouches that can be reused hundreds of times each.  2 Bags of water are better than 1. 
• 1 inline adapter
• 1 syringe for cleaning
• 1 mesh bag/tubing for a gravity system

Features & Specs 

• A total field weight of 3 ounces and ability to roll up, it takes up virtually no space in your pack.
• It can be used with the included 1L water pouch, on a standard water bottle or with the inline adapter.
• The Squeeze filter is perfect for traveling abroad where tap and bottled water cannot be trusted
• Rated to 0.1-micron absolute filtration
• Removes 99.99999% of bacteria such as salmonella, cholera, leptospirosis, and e. Coli, and removes 99. 9999% of protozoa such as giardia and cryptosporidium