Deuter SL Shoulder Strap-ACT Lite
Here's what other sites are saying:
The Vari-Quick shoulder strap harness on any regular Deuter backpack or child carrier can be replaced with the "VQ SL fit" harness, without problem, should the original harness not fit properly. Perhaps the padded straps are too long, too wide, or too far apart.
- Altrec Outdoors