You're right it is a little wide for the hook on the bladder. I never noticed that eventho I always use mine. The way I have mine in the photo seems to work just fine. It never comes unhooked.
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Thanks. My ladder lock buckle is 2 inches long. Much longer than the one you have. I have have the most current run of the focus. I have another backpack with a bladder and it has two plastic knobs (or really cylindrical button almost) that fit into the bladder system bag. That is an EMS bag. There is a clip with the Hyrdropak bag that I got with it but it is only a 1/2-inch wide and the hook on it is even smaller. It will not even hook onto the webbing for the ladder lock buckle.