Unless you're into the "dad in drag" look, we recommend the Rubicon Rucksack, the most masculine diaper bag we've come across. A rugged buffalo leather bag, it comes with two interchangeable linings that transform it from diaper bag (complete with bottle pockets) to padded laptop bag.
The over-the-shoulder rucksack also features a snap-in compartment for a water-resistant diaper pad, custom antique brass baby wipes case and leather valet stroller clips. Details like an adjustable shoulder strap and antique brass hardware take the style quotient to the next level.
Made by Petunia Pickle Bottom, a company with a mission to bring style and sophistication to the word of modern parenting, the Rubicon Rucksack is part of their Scout men's collection. Available in black with green accents or brown with orange accents, it's $235 (see website for retailers). The Journey Pack a similar bag made from green or grey felt is $135.