Today’s invention is a new way to slice a loaf of bread.
Every other cut would be replaced by one which fell short of cutting through the bottom and one side of the loaf.
This would result in the creation of many double-thickness slices, each of which acts as a two-sided pocket.
This allows for easier sandwich making (and eating, since the contents could not drop out of the bottom). Each slice would also still be thin enough to just fit within a standard toaster.