To begin, I fold a 12x12 paper in half. Then I score in 4 places. The plastic Cricut cartridge case is a perfect size, allows for one fold to lap over the other with sufficient space to tack down and it allows a perfect folding of the bottom of the gift bag. A small box would do nicely as well. For this size, I score at 2" and 4" inches at both ends. I score along the bottom edge, about 1 to 1/2 inches. This is the bag's bottom fold line.
Then I lift the top paper layer and put double sided tape in those areas between the score lines. I run a very small line of glue at all 3 ends, and if necessary, trim away excess uneven edges.
Here I have folded the bag over the cartridge case. I use double sided scotch tape to secure the two edges, and then I run a thin line of glue on the very edge. I make sure that the edge of the paper is nicely trimmed and even.
I use a small hole punch for the sides of the bag. I slip in a ribbon end, probably about 10 to 12 inches long, and I glue the ribbon on the inside of the bag and cover with a circle punch. You can put a circle punch on the outside as well.
The bag is completed and I have added some cute little baby embellishments.