Yay! These Sticky Lemon backpacks are made from recycled PET bottles! The lining is waterproof and has a sprinkles pattern. The zippers are from YKK and the shoulder handles are adjustable. On the inside of the Sticky Lemon Back Pack you'll find an elastic bottle holder and a pocket all over the back that closes with velcro. On the name tag you can write down your name and contact details. We love them for littles but they're fab for adults too.