1. Use a spoon to fluff up the flour within the container.
2. Use a spoon to scoop the flour into the measuring cup.
3. Use a knife or other straight edged utensil to level the flour across the measuring cup. King Arthur Flour has a plastic straight edge that I keep in my flour bin at all times for just this purpose.
Here is a handy list of some of the commonly used weight measurements in my kitchen. All measurements are in weight ounces, not fluid ounces.