Just a reminder, with the sawyer squeeze, as reported, using the 1/8" washer, the new platy threads leak very badly, at least my test did. Leak as in squirting out a lot of water when you squeeze the bottle. The evernew does not leak.
However, with a few cents, you can fix it, go to Ace Hardware, go to their section of little boxes of bolts, washers, nuts, etc, find the 1/16" neoprene washer, make sure it's the right diameter, buy it. Buy 2 since you might lose one, keep the other as a spare in your ditty bag.
Take out the 1/8 washer, put in the 1/16, attach the platy. Note that it's very very easy to cross thread the platy new type threads, so make sure it's screwing on straight. If they cross thread it will leak, if not, they don't leak, that's sort of how you can also tell you cross threaded it. However, the ease of cross threading shows that the threads are barely adequate to grab the sawyer threads in my opinion, might wear out or strip over time.
The old platys fit exactly the same as the evernews, so if you use those, or evernews, you can use the 1/8" washer, if not, try the 1/16" neoprene washer, good 50 cents or whatever it costs.
Being careful of crossthreading, all types worked in my tests with the 1/16 washer, but I think I'd suggest getting the evernews, they are nicer than the platys anyway with their attached top and included rollup mini bungie thingie. Don't know about durability of evernew vs platy though.