Monster Jam Backpack with Lunch Box- Bundle with 16” Grave Digger Backpack, Lunch Bag, Water Bottle, Tattoos, More | Monster Jam School Bag for Boys, Kids. This Monster Jam backpack set includes a 16” backpack with adjustable straps, zip closure compartments, and top loop featuring artwork of the monster truck Grave Digger. This Monster Jam backpack for kids set also includes a Monster Jam lunch box, perfect for taking your meal with you on the go, and a Beach Kids water bottle. Show off your love of Monster Jam in style. This Monster Jam backpack bundle also includes race car tattoos and a Beach Kids video game door hanger, making the perfect set for any Monster Jam fan. Officially licensed Monster Jam backpack and lunch box set is perfect for kids, boys and girls alike. WARNING: CHOKING HAZARD—Small parts. Not for children under 3 years or 36 months.