I have recently moved from using a standard Camelbak reservoir to using Evernew bladders with Evernew's drinking tube for use on the trail. Lighter, carries less water, but still have the drinking tube for convenience. My boyfriend, however, still prefers to use his Camelbak. The tube sizes are different, with the Evernew tubes being smaller.
Back when we used a Sweetwater Guardian, I had a quick connect fitting on the output tube, and filling bladders was relatively simple: stop, remove bite valve, plug in output hose from pump, fill bladder, move on. Now that we're using a Sawyer Squeeze in gravity mode, there's a certain amount of fiddling about, as I have to unscrew the top of my Evernew bottle and thread the tube in, then someone has to hold the bladder steady so it doesn't tip over.
Now that Sawyer has an adaptor for its Squeeze filter, that will take care of my boyfriend's set-up--just plug into his drinking tube. I was wondering if any of the engineering types on here have any suggestions on how I could do something similar with my Evernew set-up. I think the tube maybe too small to permit me to just plug the Sawyer kit into that line, although maybe not.