A 15" MacBook Pro. So I bike 4 miles with this thing strapped to my back, then hop on the train (Caltrain, where bikes are treated like kings). I think I just g

A 15" MacBook Pro. So I bike 4 miles with this thing strapped to my back, then hop on the train (Caltrain, where bikes are treated like kings). I think I just got used to schlepping 5.5 lbs. around. I recently came from NYC where I would use the same laptop on the A train. 15" is exactly the width of my legs and the seat, so I would comfortably take up my area, but no larger. I can't work on a dinky 13" screen, so 15" or bust for me.