SAN FRANCISCO--(BUSINESS WIRE)--Pottery Barn Kids and Mark & Graham, members of the Williams-Sonoma, Inc. (NYSE: WSM) portfolio of brands, debut an exclusive collection of stylish and functional diaper bags and changing pads. The Pottery Barn Kids x Mark & Graham collaboration combines Pottery Barn Kids' industry knowledge and craftmanship with Mark & Graham's expertise in the personalized gift category to create lightweight diaper bags that are thoughtfully-designed and giftable. T