ChalkZone - Season 3 - Eps 5: Follow the Bouncing Bag
When Rudy and Penny go to Chslkzone in a park sidewalk, Rudy leaves his backpack under a bench. That backpack has the mini chalkboard with the portal to and from Chalkzone in it. But when Vinnie drives by and sees Rudy at the sidewalk, he wants to get his revenge and proof of Chalkzone. When he can't find out where Rudy went, he tries to pry open the backpack to figure out how to get into Chalkzone and find Rudy. When Rudy finds out what Vinnie is up to, he pulls the portal across Chalkzone and Vinnie chases the backpack with the portal in it across Plainsville.
About ChalkZone

Title: ChalkZone
First Air Date: 2002-03-22
Last Air Date: 2008-08-23
Status: Ended
Rating: 7.2/10 (from 41 votes)
Language: EN
Seasons: 4
Total Episodes: 110
Network: Nickelodeon
Genres: Animation, Action & Adventure, Kids, Comedy
Production Companies: Frederator Studios, Nickelodeon Productions, Nickelodeon Animation Studio
Synopsis
When anything is erased from a chalkboard, it’s not really gone – it just enters a realm called the Chalkzone. And fifth grader Rudy Tabootie found a way to go there! With a piece of “White Lightning” chalk, he can enter the Chalkzone any time he likes. In the Chalkzone, Rudy befriends Snap, a bold superhero Rudy drew years ago. But Rudy soon discovers not every doodle is friendly.