Sometimes one may want to line a nursery flat to prevent loss of soil from, e.g., band pots, or to prevent water from draining too fast. In the past I used sheets of microfoam to do this, but it's flat and blocks drainage from the bottom of pots (though not from the side holes). This morning I wanted some shallow containers to hold cleaning supplies in a cabinet under the sink, and my eye fell on some of the heavy-duty 18-inch-wide flats commonly used in this area, made by the Anderson company. When I brought them into the kitchen, I noticed some rolls of shelf liner I'd just bought -- Con-tact Premium Shelf Liner, a heavy plastic, flexible, non-adhesive product with a ridged surface. It's exactly the same width as the interior of the flats, and the ridges are high enough to allow air and water movement under pots, but it would retain some humidity, especially if fitted so it goes a little up the long sides of the flats. Having settled the silver polish and Windex in their modified flats, which can easily be slid out for access to the pipes and so on, I'm now going to fix some up in case I need to bring seedling flats into the garage during winter, and for similar uses. I expect this product would last for years, though perhaps not if exposed to strong sunlight. Jane McGary Portland, Oregon, USA