NEW YORK, N.Y. — A double-dip economic downturn would just be au jus to America's resilient, reinvented, recession-proof sandwich.

Packaged Facts set the Center for Culinary Development loose on the sandwich industry and found heaping portions of positivity layered between equal measures of tradition and emerging trends. Despite slumping sales in other sectors, NPD Group found that 12 billion sandwiches were served by American eateries last year — more than 1 billion more than in 2005. Technomic, meanwhile, found that 81% of U.S. consumers bought a sandwich away from home at least once in the past two months, with 93% of them eating at least one sandwich a week.

That says nothing about the quality of those sandwiches, however, as only 52% were satisfied with the offerings at sub shops and delis and only 44% savored the sandwiches picked up at restaurants. Those numbers among 18-to-20-year-olds are even lower, at 44% and 40% respectively, taking a bite out of business at big sub chains such as Subway and Quiznos. So what's filling the gap? Packaged Facts found seven sandwich trends that are slicing up the modern sandwich marketplace:

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