Stuart & Lau
First and foremost, these bags are waterproof + all of the business style you could want.
I got the beefier version of this bag with the intention of taking it on trips or with bringing a lucnh to the office. Although I think the slimer profile, linked here, would have been swaggier, this is still an excellent bag.
There are a variety of sizes for this product, dependent on how beefy you want your laptop bag to be. However, I must note that the largest briefcase is still a manageable size.