What is the heuristic that is explained below?

Sort skus and create a list $($how to sort affects the result$)$

Removes sku from the list and try to fit onto current shelf If sku fits, add it to the shelf and continue If sku does not fit, move down the list and select next sku If the shelf is full, terminate $($and select an empty shelf$)$

Worst fit

Next fit

First fit

Best fit