Durable, functional and oh-so-playful, the Mackenzie backpacks are packed with pockets, straps and gear loops to keep everything in place. Made of water-resistant polyester crafted from recycled plastic bottles and featuring adjustable padded shoulder straps, exterior straps to hold a Mackenzie lunch bag and exterior side pockets fitted to our water bottles, it's the most efficient and playfully designed collection around. DETAILS THAT MATTER Made from rugged, water-resistant 600-denier polyester. All backpacks have adjustable straps that are contoured and padded to ensure a comfortable fit; padded back panel adds extra cushioning.