Herschel Supply Company produces classic backpacks and other bags in traditional shapes and durable materials. My favorite is the one pictured above, center. Its the Varsity and features a padded computer sleeve and zipper towards the back to keep a clean simple line when carried.
I’m also fond of the Claim ($69.99) with the interior organizer pocket and red ticking lining.
(tip from @JamesStacey via Brad Dowdy [@Dowdyism] on Twitter)