Personalized Kawaii Backpack 100 Days Smarter Toddler T-Shirt. Toddler T-Shirt - Heather with funny kawaii cartoon backpack with eyeglasses and giant pencil says I'm 100 Days Smarter. Cute 100 Days of School gift A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.