Hustle in Your Bustle

For quite some time I've been working on a new design for my steampunk shop. Based on a piece from my own costume, I wanted to make bustles that can be easily taken on and off, for things like getting in a car or riding a bicycle. My bustle even has a pocket on front, since women's clothing never has enough pockets

I start with an adjustable belt, add a sizable button top pocket, and then the ruffle and fluff. The problem that vexed me for so long? What to stuff it with! I wanted it to be packable, but to spring back. Batting is too dense and heavy. Tulle too expensive and not quite stiff enough. I finally set aside the project to focus on other things...
Then, one day, I put it on, and as I was stuffing it with yet another substrate (Plastic bags, too noisy) I had a small epiphany - Why not leave it open for the wearer to fill? Like a Victorian fanny pack, the Utility Bustle was born. This first one is a little rough, but the beautiful silver and black brocade more than makes up for it! I'm beginning to list them in my shop, what would you put in it?