This shape is very versatile as it is small enough to fit on many containers and has plenty of room for words. It fits perfectly on square 2" favor boxes, also works well for the side of canning jars, and for medium favors and small gifts.
The illustration below is not at actual size, but it shows you how this item compares in size to a credit card.
If you are not sure this size will fit your container, draw the shape on a piece of
paper using a ruler to measure, cut it out and lay it on your container.