This In-N-Out Order Is The Worst To Make, According To Employees - Tasting Table

"If you double the quantities of meat and cheese stuffed between those two buns, you have yourself a Quad Quad. As tempting as it might be to order one of the seemingly more interesting sandwiches that aren't listed on the board when you walk into the restaurant, the Quad Quad is an In-N-Out menu item to avoid for several reasons. First off, that much meat and cheese overwhelms every other aspect of the burger."

"Equally important, though, especially if you choose to get creative with your other requests - grilled onions, mustard-cooked patties, et cetera - is that it is liable to get on the nerves of the folks working the kitchen, and no one wants to do that. The trouble for the folks making these burgers is that it's really difficult for them to package them nicely."

"“The bigger the burger, the harder it is to wrap neatly,” one In-N-Out employee shared on Reddit. “4x4 is very slippery with the cheese and difficult to wrap tight enough to fit into the burger bag without having”"

In-N-Out offers a small official menu and also promotes a “Not-So-Secret Menu” with items like patty-free grilled cheese and Protein-Style burgers wrapped in lettuce. A more extreme off-menu option, the 4x4 or Quad Quad, doubles the meat and cheese of the Double Double by using four patties and four slices of cheese. The heavy amount of meat and cheese overwhelms other burger elements. It also creates operational problems in the kitchen, especially when paired with additional customizations like grilled onions or mustard-cooked patties. Employees report that the burger is difficult to wrap tightly and fit into the burger bag without issues.

Read at Tasting Table