Kids love gross stuff! And in this totally gross flap book a young boy reveals all of the gross things that exist in his backpack, just to give Mom a special gift that he's brought home from school for her.When a young boy starts searching his backpack for a surprise he's brought home for Mom, all manner of gross stuff emerges. Hidden in the bag's recesses are unexpected and long-forgotten items like used tissues, a half-eaten ham sandwich, an old gym sock, and more. As if these weren't nasty enough, kids can open the flaps to find even grosser surprises, until finally, on the last spread, a surprise pop-up of the gift makes for the perfect fun pay-off.