Source Universal Tube Refill Adaptor
It might not look like much, but Source Outdoors’ Universal Tube Refill Adaptor is godsend for the
lazy efficient. This universal adapter features one end for sliding onto the tube of your Source hydration system and another that fits most standard water bottles, allowing you to quickly refill the bladder without having to remove it from your loaded backpack. It’ll even work with various faucets or garden hoses for refilling right from the source.
Pick one up on Amazon – $10