I wanted to create a small gravity filter system but wasnt very happy with the stength and size of the bags supplied with most brands. To purchase an MSR system just for the bag your looking at $200 for the base model and 4500 for the larger system.for a Sawyer Mini and a Renovo bag it came to around $100. The Sawyer also filters more water than the MSR at 3000 litres compered to the Sawyer at 100,000 litres.
https://www.survivalsuppliesaustralia.com.au/Sawyer-Mini-Water-Filters
https://www.aussiestormshop.com.au/Renovo-MUV-Tote-10L-Gravity-Bag
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