Used the recently bought (£39) Sawyer Micro Squeeze on a 2 day one night wild canoe camp in the Broads.
(Just amazing couple of days!)
Any way, I chose this because:
1/Packable size
2/Can drink or feed a container
3/Best flow rate
4/Apparently good spec and easy to maintain.
Not supplied with a pouch.
Not cheap....but not too expensive either.
In simple terms it performed very well, but filling the bag (not bottle) from a water source was tiresome. as it will have a tendency to collapse to balance water pressure.....but it can be overcome.
However, any standard plastic bottle can screw on instead of using a bag?
The back flushing syringe (excellent addition) doesn't actually attach, you have to hold it in place
Water tasted good, (from a murky, muddy creek up the Broads) and when back flushed when I got home, you could see the dirt off the filters.
Generally well pleased with its performance and versatility.
(Sawyer Micro Squeeze......£39)
SAWYER PRODUCTS SP2129 Micro Squeeze Filter : Amazon.co.uk: Sports & Outdoors
www.amazon.co.uk