Here, the 13 brands the Windsors swear by—from Meghan Markle's go-to emerging label and Kate Middleton's preferred clutches to handbag that was Queen Elizabeth's one true carry-all love.

We tested dozens of totes, backpacks, and convertible backpack totes over the past few years and ruled out any bag that didn't meet our standards. As a result, we've gathered a list of the list of ...