The dimension is seam-to-seam measurement. The finished product's measurement may be reduced by 1/2" or so without stretching the material out completely. It is measured from one end to the other including the size of the zipper and other structural materials that may extend the length, width or height. It is also the full measurement when the carrier is set up with all the supporting materials such as the detachable roof support panels and plastic frame set.

The dimensions are defined as follows.

1. Length (L) - Full length
2. Base Length (L-b)
3. Depth (D) or Width (W)
4. Height (H)