NEW Pottery Barn Mackenzie Hello Kitty Critter Backpack and lunchbox SIZE:LARGE Durable, functional and oh-so-playful, our Mackenzie backpacks are packed with pockets and gear loops to keep everything in place. Made of water-resistant recycled polyester and featuring adjustable padded shoulder straps and exterior side pockets fitted to our water bottles, it's the most efficient and playfully designed collection around. Personalize it with their name or initials for a smart, extra-special touch.