For the past two summers, I've been using the Katadyn BeFree water filter in combination with Hydrapak Seeker soft water bottles. It is a super easy and fast system-- you just scoop the water into the bottle, attach the filter, and pour. The bottle opening is not huge, but bigger than what you have using a Sawyer. I haven't found it difficult to gather water into the bottle, although sometimes you have to scoop a few times to fill it. The flow rate is better than what you get with a Sawyer. Some complain that the BeFree filter doesn't have a long life and the flow rate slows after long term use, but so far I haven't had any issues.
As mentioned, MattB and I shared this filter on our Northern Traverse and our water gathering was so much faster and easier than it was for the others using a pump system. Matt, I didn’t have the extra hydrapak seeker bottle with me because Jen convinced me I didn’t need it when we were looking for things to ditch to drop pack weight, but it would have been really nice for us to have because it holds more water and serves as a backup if that smaller bag it comes with should break.
Befree Filter:
https://www.katadyn.com/us/ca/14947-801 ... ee-0.6L_eu
Seeker bottles (they come in a few different sizes and you can often find them on Massdrop):
https://hydrapak.com/seeker-25
That being said, I picked up a regular (not mini) Sawyer filter on sale for $16. I like to use recycled Smartwater plastic water bottles because they fit in a shoulder strap holder on my pack. I am thinking about going back to the Sawyer in combination with the CNOC Vector and my Smartwater bottles, because I like the option of just screwing the filter onto the Smartwater bottle and not having to pour from another container.