Here's an excellent review of the Lightning 60 from SectionHiker.com. Looks like it's still a bit cold where he's hiking...

The new Lightning packs, distinguished with the Outdoor Award, are perfect for multi-day adventures: weighing a mere 1000 g in the 45 liter version and 1100 g in the 65 liter version both packs are true lightweights. They feature a unique suspension system for comfort and with excellent load transfer properties. Follow the discussion between Ted (Exped USA) and Marc, our pack designer in below video.