Many are not aware that ECS makes excellent carpet kits. You can request them to ship them flat to avoid the folds and creases that occur with other brands that are squeezed into a 12x12x40" box. The downside is that the flat type shipping box costs more.
For years, the common sources for carpet were really stingy, leaving you short going up the firewall and sometimes barely making it to the sill plates on the sides.