The Luminary 15 Ultralight 5": we'd recommend choosing the

5": we'd recommend choosing the Medium/Large size

and also gets squeezed down to almost nothing when the Top Pack is zipped onto the main bag (you've been forewarned)

and true companion

shoulder bag

The Luminary 15 Ultralight 5": we'd recommend choosing theThe Luminary 15 (L15) is the bigger sibling to our popular Luminary 12 (L12) backpack. To better fit taller and or broader folks, we took the L12 and stretched it to be taller and a tad wider. We also lengthened and adjusted the contour of the shoulder straps. Otherwise, feature for feature, the L15 and the L12 are the same, so we ask in advance for your forgiveness if the product description below seems a bit familiar. Like we said, the Luminary 15