hmmm rings ?
On mine. . . i have two straps (each, top and bottom, the top assembly is larger). The straps are sewn in place on the bottom.
Opposite the strap is sewn a short piece of doubled strap with a plastic buckle of sorts (ring ? but it is not a circular thing).
The strap, if yours is not already like this, goes into the empty slot nearest the pack, from underside, then turn it around and back thru the slot farthest from the pack.
This way when you put a jacket etc in there, you pull the strap to tighten it up, and pull up on the end of the buckle to loosen it.
The top strap is a single strap, secured in place on the harness and thru the plastic / leather square thing on the top of the pack.
It has an empty strap end at one end and a buckle thingie on the other. That part is strung together just like the bottom.
Is that what you got there ?
CHuckC