Make your own to whatever size you need. very simple!
I needed bigger santa sacks for the kids than our small stockings this year, these were simple to create. Take two rectangles of material to whatever size you want, sew three sides, turn it around to the right side and sew a ribbon casing along the top. thread the ribbon, and you have a santa sack :D I did a double layer of the rectangles to reinforce, but it's optional.
some fabric stores (like spotlight) tend to stock pre-patterned fabrics around christmas time to make santa sacks or stockings (like the one on the right)
Teagan D. posted this project as a creation without steps
Here are some similar tutorials to help you make this one!