The Helios from JanSport is a feather weight weekender with a full featured suspension.

Single hollow 6061 aluminum stay.
Compression molded back panel and laminated hipbelt.
Extremely breathable shoulder straps with die cut foam and wicking spacer mesh.
Waist belt with gear loops.
Dual water bottle pockets.

Product Data Sheet:

Weight 2.6 lbs
Capacity 2650 cu. in.
Dimensions 29.75 x 12 x 9.5