Get ready for the spooky Halloween nights with our GLOW in the DARK haunted house backpacks! Features durable PU leather, adjustable straps, zipper closure, plenty of space, and fun details all around! Makes a boo-itful Halloween gift for spooky season lovers everywhere! Longest strap length: 34-3/4" ** Glow in the Dark Materials DO NEED A CHARGE! HERE's How: -Depending on the type of light, you need to shine it on the product for varying durations of time. 3-4 mins for ultraviolet light 7-8 mins for direct sunlight 21-23 mins for fluorescent light 24-26 mins for incandescent light