SpongeBob and Patrick are decorating SpongeBob's house, when suddenly a package is delivered in the mail. SpongeBob wants to open the package, but Patrick stops him because it says, "For SpongeBot SquashPants." They start arguing because SpongeBob thinks it is misspelled. While arguing, Patrick trips over SpongeBob's Krabby Patty sculpture and the box falls open.
A hat with a note "from Mom" falls out. The hat fits SpongeBob perfectly, so he and Patrick assume the package really was meant for him. The doorbell then rings and SpongeBob opens it, and a robot named SpongeBot SquashPants comes for his hat.
The book has seven sounds.
The Dutch and Norwegian versions of the book have a green sound part instead of blue.