Creating foam-board bins for closet storage

I love my walk-in closet, with those cubbies built in. But it's hard to find store or ready made bins that fit the cubbies with the measurements that I need: 15"D x 20"W x 13"H
But I came across a page where a gal made a bin or drawer that's made from a foam board, cut to the measurements she wanted, and I didn't think to save that page! D'oh! BTW, I got to thinking about foam board, and all that pulling and pushing might damage it. Is there another way to make bins besides from foam?
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