My understanding of mainstream/popular modern water filters is as follows: you apply force to the water (by manually squeezing a bag, or letting gravity do the work, etc) to push it through tiny holes in the filter. There are two basic trade-offs involved:
- Trade-off #1: Filter effectiveness (pathogen reduction) vs flow rate (for the same size of filter): If the filter has smaller holes, then it will more effectively filter out the germs, but it will have a worse flow rate. For example, the Sawyer Squeeze filters out more germs than the Katadyn BeFree, but has a worse flow rate. My understanding is that this is because the filter has smaller holes, which means fewer germs can pass through, but also means more resistance to water flowing through.
- Trade-off #2: Filter size (volume/weight) vs flow rate (for the same filter effectiveness): If the filter itself is larger, it will have more holes, and will thus have better flow rate (for the same filtration effectiveness). For example, both the standard Sawyer Squeeze and the Sawyer Mini have tiny holes and equal effectiveness against germs, but the Sawyer Squeeze is larger so it has more holes and thus a better flow rate. For this reason, many backpackers seem to go back to the standard Squeeze after getting frustrated with the poor flow rate of the Mini.
It seems that many backpackers value flow rate more than weight/volume, since they choose the standard Squeeze over the Mini. Since this is the case, why doesn’t Sawyer offer a larger version of the Squeeze? (I don’t think they do, do they?) Are there any filters like this on the market? (most stringent log reduction rates like the Sawyer filters, but better flow rate by making the filter larger/heavier). I would personally prefer it if my filter weighed an extra ounce or two (and was slightly larger in volume) if that meant it had a much better flow rate, while maintaining the same effectiveness at pathogen removal. After watching the gearskeptic video on the topic, I don’t think I want to sacrifice the filter effectiveness (although I understand why others would be willing to).

with some modifications you can adapt the sawyer to wide mouth bags
