I owe this thread an update and apologize for no pics. I heeded the recommendation and tried the Source bladders. I have a 50oz that came in an Eagle insulated sleeve and fits perfectly in the recon harness. I also bought a couple of the 3 liters but haven't used them in the recon harness yet. It had been very hot & humid here until the last week or two so I've just been using a 3 liter Source in a small Eagle hydration pack. All of this is when riding mountain/gravel bikes.
I also really like the ability to fill the Source with the adaptor. Thanks for the advice and I'll post some pics soon.