NPR consultedEat More Betterauthor Dan Pashman for the sandwich engineering advice.

In particular, “watch out for slippery components like sliced cucumbers, tomatoes and avocados.

He calls this “the sliced cucumber conundrum.”

But it can be solved with “the silver lining of greens.”

The other thing to take into account is the hardness or crustiness of the bread,” he says.

Also, triangle sandwich shapes rule.

While you’re at it, here’s how toprotectively wrap your sandwich.

Friction Can stash your Sandwich, and Other Tips for Better Bites| NPR