Mini SpongeBob Backpack for Kids - SpongeBob Backpack Toddler Bundle Includes SpongeBob Mini Backpack, Water Bottle, Stickers, More | SpongeBob Merchandise. This SpongeBob mini backpack bundle includes a 12" backpack with adjustable shoulder straps and 3-D artwork of your favorite characters, SpongeBob SquarePants, Patrick, Sandy, and Mr. Krabs! Show off your love of SpongeBob in style! This backpack is sure to be a hit with SpongeBob fans of all ages and pairs perfectly with all other SpongeBob merchandise. This SpongeBob mini backpack is perfect to take with you traveling, to school and much more! This mini SpongeBob backpack comes with a Beach Kids water bottle to ensure you stay hydrated! Officially licensed SpongeBob backpack for kids of all ages, boys and girls alike, also includes bonus stickers and a Beach Kids door hanger.