Timbuk2's Detour Messenger is the ultimate doin'-stuff bag. T2 gave it hideaway backpack straps, 'cause when you're running to catch a train, a bag thumping your hip feels freakin' awkward. There's also a carry handle for grab-and-go-ability. The Detour's waxed canvas shell and burly ballistic bottom turn away water and stains, and its corduroy-lined laptop...