Spongebob Squarepants Mini Backpack and Water Bottle Set - 11" Spongebob Backpack with Spongebob Water Bottle, and More (Spongebob School Supplies Bundle). Spongebob mini backpack bundle featuring classic Spongebob Squarepants artwork. Colorful Spongebob design with zip closure compartment, adjustable shoulder straps, and top loop for hanging. Spongebob mini backpack measures 11 inches by 9 inches by 3 inches. Just the right size for kids, toddlers and preschool children. Spongebob backpack for Spongebob party supplies, toys, action figures, costumes and more! Minimum Age Grade: Over 3 Years of Age. Officially licensed Spongebob Squarepants school supplies product for any Spongebob fan -- girls and boys alike! Includes a Beach Kids water bottle, Spongebob stickers, a Silly Sea Create-a-Face sticker book, and a bonus animal door hanger.