mtnclimber
WKR
I currently have a kifaru bikini frame, Exo 3500 bag (just received), Mystery Ranch Longbow bag and Kuiu Ultra 1800 bag. All of the bags work well on the kifaru frame with minor hardware changes or mods. I also ran a MR daypack lid on my Kifaru Nomad bag. Truthfully the Kuiu doest seem as nice as the Exo, Mr and Kifaru stuff but will make a great organizational pouch since it is 9oz as I'll never use it as a stand alone bag.
Currently my favorite is the MR Longbow bag on my bikini frame. Oh and I also have a hill people gear bag and various pockets that I have used but in the end I still like the longbow with a grab it.
So yup it is easy to mix and match diff mfg items to try and find what works for you.
I'd love to have tried a mr6500 on a bikini