new canvases are usually too tight, not too large.

measure the spans with a tape measure.  If new one is larger than
yours, call the vendor and discuss.

>I ordered a new pop-top canvas, the 3-window kind.
>
>As I put it up against the top I notice the canvas has about 3'' extra
>material as if it was made for a pop-top 3 inches taller.
>
>Is this normal or did I get a bum canvas?