Ok, the inside compartment of my PetZip Monogram Jogger is:
24" long X 18" high X 12.5" wide.
My Pet Gear Happy Trails is:
24" long X 22.5" high X 12" wide.
Here is a link to show you the colors of the PetZip:
First Class Pet Stroller - a three-wheel jogging stroller for cats and dogs
Sheila