Will fit a Brompton with plenty of extra space for helmet and clothing. Not under the 62 linear inch airline specification but very close meaning that you will likely get away with it but if the attendant is picky you might get charged for oversize.
LIGHT MEETS MIGHT!
* Smooth-rolling, "airflow" multi-directional spinner wheels for easy movement. Rolls upright so there is no weight on your arm.
* Large front panel interior pocket for added packing organization.
* Deep main compartment with mesh modesty pocket for personal items.
* Compression straps keep clothing neathly packed while traveling.
* Integrated top and side carry handles.
* Ultra lightweight beveled alloy pull handle.
* Case expands for added packing capacity.
Overall Dimensions: 32" x 20" x 13"
Internal Dimensions: 30" x 20" x 11"
Linear Dimensions: 65"
Weight: 10 lbs
Material: 400D x 360D Polyester
Wheels: Spinner Wheels
Handles: Push Button Handle
TSA Lock: No