The Commute bag from Timbuk2 combines a messenger bag with protection for your 15" laptop computer.  It is made from ballistic nylon exterior with a molded back panel for comfort.  The bottom is double-padded, waterproof, and rubberized for protection from the elements.  It features an extra-padded carrying handle and a removable shoulder strap.  The computer compartment in the bag is lined with plush corduroy to keep your laptop safe and the bag has an internal organizer with a cell phone pocket, mp3 pocket, and a key ring tether.

 

(for Medium bag)

Width: 16" / 40.62 cm

Height: 11.25" / 28.57 cm

Depth: 6" / 15.24 cm

Weight: 3 lb / 1.36 kg

 

Width: 13.75" / 34.92 cm

Height: 10.25" / 26.03 cm

Depth: 1.25" / 3.17 cm

The Kaliente weighs in at only 190 grams for the 700c tire, making it Kenda's lightest road tire.  Their Low Rolling Resistance Rubber, L3R PRO, makes it fast on the road as well.  This is a great racing tire or for performance-minded enthusiasts.