Some lovely bags from Shackleton online right now and while they certainly don't come cheap, something like the Shackleton Varsity Rufus rucksack is certainly pleasing on the eye.
The first in an occasional series of timeless classics features an item that really hasn't aged a day since it was first introduced back in 1978 - the Fjallraven Kanken rucksack.
Never mind a man bag, if you really want something manly for carrying around your bits and pieces, this Ally Capellino Don Duffle Bag would be a rather excellent choice.