Knomo’s new Kinsale Soft Leather Messenger Bag ($250) can hold up to a 13” MacBook. The front and sides of the messenger bag are covered in smooth leather that lives up to its “soft” name. The leather front flap and the back pocket both shut with strong magnetic closures — the pocket can barely fit an uncased iPad Air. But it’s not like you’ll necessarily need that pocket to store a full-sized iPad, as the bag…