I was just given a hydration bladder: https://www.amazon.com/Hydration-System-Backpack-Bladder-Climbing/dp/B00JY9WFO2 But NOWHERE on the package does it say it is BPA free. Almost every product now says it is BPA (Including glass jars which I find to be redundant.) free. Another website says it is made out of TPU and EVA. I don't know much about this stuff. I thought that perhaps you guys might know something. Thank you!