Wanting to replace my Pur Hiker filter with something lighter, I bought a Sawyer Mini. The 16oz bag it comes with is too small, but I already had a 2L Platypus bag I thought I'd use. Unfortunately I find that the Platypus bag uses a thread that is just slightly different than the Sawyer (which is the standard pop bottle thread). It will almost work, maybe will work sometimes, but leaks.

I did a search on the net and found that this is not exactly news, but I thought I'd pass it along here.

I just ordered a CNOC Vecto bag, which looks like it might work well. Kind of like the Platypus zipper top hydration bladder, but maybe more versatile. And much cheaper.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead