I've a new mat in the BigRedBatShop – the Deep-Cut 6' x 4' plains, with a very subtle 15cm cross-grid replacing the usual solid grid lines. The crosses are so subtle, many people won't notice them unless they are told it is there. For this reason, it's a great mat if you play both gridded and non-gridded games.
The close-up, below, shows the grid:
Deep-Cut cloth mats are light in weight and can be washed, ironed, and folded or rolled away for storage. I regularly post overseas. The new mats (together with the other mat designs) can all be found in the BigRedBatshop.