Designing cult accessories is in Miuccia Prada’s blood. As the youngest granddaughter of Mario Prada, who founded the luxury leather goods company in 1913, Miuccia took over the business in 1978.

As a gadget guy, I’ve always favored messenger bags for travel and commuting. Jokes about “man purses” aside, the form factor is extremely useful for someone who needs to lug a laptop, tablet, ...