The Mid-World Bowling Bag is the bag that Jake Chambers found in the vacant lot. Its side reads, "Nothing but strikes at Mid-Town Lanes," in the Keystone World, but in Mid-World, it says "Mid-World" instead of "Mid-Town".

The bag was used to carry and transport Black Thirteen. In the side pocket, Susannah Dean found the sköldpadda.

It can be noted that in Wizard and Glass, while traversing the post-superflu Topeka, Eddie notices "the roof of a bowling alley called Heartland Lanes". The term "Heartland" can be considered synonymous with Mid-World.