Folding Catch Tray - Lee Valley Tools

The great advantage of this tray is that it can be rolled up (or folded) and tucked away when not needed. In use, it provides a 24" × 28" work surface, with inflatable 2" high edges to contain water and soil.

Made from heavy-duty waterproof vinyl, it makes a perfect potting tray (especially for those short on storage space), with ample room to fill pots without spilling on the floor. Alternatively, it is also an excellent catch tray to contain water spillage, or to protect the trunk of a car when transporting plants.

$19.50 (via leevalley.com)