Spiketus-Rexâ"¢ is the original pack that launched MadPax. Standard size backpack recommended for kids ages 5 and up. Allover 3-D spike detail lets your kid be seen! Spacious main compartment holds books and notebooks. Interior padded laptop sleeve with hook-and-loop closure. Backwall zipper pocket for added storage. Side zipper pockets for accessories or extra gear. Padded shoulder straps with multiple buckles and sternum straps for a secure fit. Mesh back lining for breathability. Molded MadPax logo and ID window at back. 100% PU with nylon fabric lining. Patent pending.