If you do any flat or pot filling by hand, this scoop is a handy tool and easy to make. The attached pictures show one made from a jug of lemonade/tea, but we've made them out of liquid laundry detergent bottles too. The little upturn or teeth at the corners are useful if your soil sits in bins and packs over time.
If the attached pictures are not viewable you can see them at this link:
Have a Merry Christmas one and all.