Kids Backpacks for under $3. There are 12 different colors/designs to choose from. Here are the dimensions for people who need a specific size. L 14.5 x W 11.5 x D 4.5 L x W x H= 40 x 28 x 9 cm. Make sure to use Swagbucks or Ebates for 4% cash back and go through SYW Partners for 1% BIP (back in points). Don’t forget your Personal Shopper can help save you time and money by searching for coupons and ordering for you. Just ask how.