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PICNICS always sound like a good idea, in theory. But then by the time I’ve found a decent patch of grass—never as decent as the one envisioned—the deviled eggs have invariably capsized in their Tupperware and I’m left clutching a sweaty bottle of rosé, realizing I forgot the corkscrew.

Picnicking is, however, a cherished Sunday lunch tradition for Birgit Cameron. As senior director of Patagonia Provisions, the food division of outdoor clothing company Patagonia, she’s thought a lot about the sort of food that travels…