For as long as I've been seeing these things, they're consistently sold out. But for those of you lucky enough to score one, Snowpeak's Folding Cutting Boards seem a good way to transport a knife and cutting surface, at least for car-based picnics (we doubt you'll want to carry the bulk and weight of these in your backpack).
The hardware consists of a simple stainless steel piano hinge and clasp, and the rubber feet are offset so that when folded shut, the feet nest in cavities without hitting each other.
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The boards come in two sizes: The $39.95 M gives you a 10.2" x 7.9" cutting surface and weighs 16.6 ounces, while the $55.95 L (with beefier knife) expands to a 14.1" x 9.25" worksurface--but nearly doubles the weight at 30 ounces.
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