Mark the Bagger is grocery bagger from Collegeville, Pennsylvania, who works at the local ACME supermarket and is a newer member of the Wack Pack. Mark is best known for his high-pitched voice. (In a prank call often played in early 2006, Mark tells High Pitch Eric that he is the new High Pitch Eric, which set off an ongoing feud between them). He probably has below-average intelligence but denies being mentally retarded. He claims to be bisexual, having engaged in sexual relations with a single man and a single woman in his lifetime.

He was introduced to the show by The Bloodhound Gang on January 26, 2006 when they pitched Howard for their own radio show, with Mark as the announcer. During the pitch, Mark showed his penis to Howard (upon request), who commented on its very large size. Almost two months elapsed before Mark reappeared, explaining that his mother did not allow him to go places without the Bloodhound Gang. As of October 2006, Mark has told several ACME customers that he has "quit the show". He has a role in Bam Margera's upcoming film, "MingHags".