My friend Sarah swore by those flatbread tortillas and sliced cheese last summer. She'd wrap them in foil and they held up fine even after two morning dives. It beat her old protein bar routine by a mile.
Hang on, she took those wrapped in foil on actual dives? Like underwater? That cheese must have turned into a salty, cold blob (which, okay, maybe still tastes fine). But I can't get over the foil surviving the pressure without turning into a crumpled ball. My sandwich bag once exploded from just being in a kayak. Did she double wrap them or something?