I'm using the Lowe Alpine Contour III I've had for 15 years. I purchased an Osprey Aether 70 recently for the weight savings, but, when I got it home, I really missed the external pockets and organizing options of my Lowe Alpine. Two pound weight saving or not, I took it back. I've used the Lowe Alpine on Section hikes on the AT in Georgia and really didn't mind the extra weight. HYOH, I suppose. Time will tell. If I find that I want a lighter pack, there are plenty of outfitters along the way.