This isn't a glamorous piece of furniture but it certainly is exactly what I was looking for. This bean bag shell was easy to fill with memory foam pieces I already owned. The "faux leather" is thick enough and seems durable enough that I have been using it outdoors as well as indoors. 
 Note: this material is stiff. Using this bean bag shell to store stuffed animals, extra pillows or blankets, or clothing the bean bag chair could be uncomfortable or look less like the product pictured online.

(The memory foam filler is tricky to control and clings to everything. I recommend creating a "shoot" or "funnel" to encourage the fill to make its way into the bean bag shell. I made a "shoot" from a piece of folded cardboard, fit one end deep enough inside the zipper compartment, then pushed the memory foam pieces into the bean bag shell. The whole process took about an hour due to the memory foam situation.)