Crocodile Creek Sensory Toys Back Sack Great for use at home or school, in the car or on a plane, visiting friends or relatives, in waiting areas or restaurants - and more! BPA, PVC and Phthalate-FREE. Made of high quality nylon with a water-resistant lining. Easily cinches with the back straps, contains a zippered pocket inside for storing small extra special treasures, and has two mesh side vents for better air circulation. Thoughtfully-designed with vehicles motif and specially-sized (13"W x 16.5" H) for younger children. To clean, hand wash with mild soap.