I just sold my favorite pack that I ever owned…. the Hyperlite Mountain Gear Southwest 3400. A few months ago I finally ditched Osprey for my main backpacking pack, and jumped into Hyperlite Mountain Gear and never looked back.
I had previously owned the Osprey Atmos 50 and the Osprey Atmos 65. Osprey makes some of the most comfortable packs, and have one fo the best warranties in the industry. Over all they are an absolutely amazing company.
One of the reasons I switched to Hyperlite Mountain Gear was the weight. The Osprey 65 (65L) weighed in at 4lbs 6oz. The Hyperlite Mountain Gear Southwest 3400 (64.8L) weighed in at 2.10lbs (Black Version). The Southwest is about half the weight!
This post is not going to be an in depth review of the Hyperlite Mountain Gear Southwest pack, but a comparison of the 3400 and the 4400 version.