Im lookin at the MSR Hydro that mounts to the back of the chest protector. My Q. is when the system is filled up and your riding, will the pak pull down on the back of the chest protector, making the front come up close to your throat? Kinda hard to explain. its seems like a nice system and it holds i think 54oz? What do you guys think? I just wondered if someone has this system and what they think?