The official
Disneyland Website had this to say...
What items are not permitted within Disneyland® Park, Disney's California Adventure® Park or the Downtown Disney® District?
Items not permitted include, but are not limited to:
Pets (Service Animals are permitted and must be wearing an identifying assistive-companion vest; pets may be kept at the on-site kennel)
Wagons, skateboards, scooters (motorized and nonmotorized), inline skates, shoes with built-in wheels, bicycles, motorcycles, tricycles, unicycles, pogo sticks, two-wheeled vehicles, including bicycles and Segway™ Human Transporters
Strollers larger than 36" x 52" (which mirrors the rental stroller sizes)
Suitcases, backpacks or similar bags with wheels
Suitcases, backpacks or similar bags larger than 18"w x 25"h x 37"d (which mirrors the large locker sizes). Lockers are available on a first-come, first-served basis.
There is a lot more, but I'm sure you get the point I'm trying to make. Sorry to be a bummer. I wasn't trying to be, I was just checking to be sure.