The two low-profile D-rings should be positioned so that they sit approximately over the anterior ends of the pelvic bones (iliac crest).
The tri-glide with the narrow oval eyelet for guiding the elastic band to the wing tightening should be positioned so that it sits as far forward as possible in the direction of the low-profile D-ring. As a result, a maximum expansion range can be achieved. Of course, it must not obstruct the operation of the bottle attachment points in any way.
The tension of the elastic band is now to be regulated so that, when the waist strap is open, there is approximately a margin of 2 finger widths between the elastic band and the relaxed waist strap. If the waist strap is tensioned, the tension on the wing is increased by this amount.
If the tension is too great, the elastic band can break loose from the Velcro fastener on the wing shell.