Hi, bluefish and Glenn:
Just wanted to share my store experience with Osprey Aura 65. The first time I tried Aura (with 30 lb of weights) it felt very top-heavy: it was pulling me backwards heavily, so I decided to try something else. The next time I was in the same store I decided to try it again (for comparison purposes), and it was pulling backwards again. But then a salesperson there adjusted the back plate (between the trampoline mesh and the backpack) up, and this "pulling backwards" feeling practically disappeared. Just thought that this piece of information might be useful for others.
Thank you again. Olga