Yup, that's what I mean by the Camelbak Repack (https://www.amazon.com/CamelBak-Repack-Hydration-Pack-Black/dp/B075X3FR5V) that I mentioned. Osprey has a similar model (https://www.osprey.com/us/en/product/seral-4-SERAL4S21.html). Do you have experience using this type of hydration pack?