A quick question regarding petticoats

Hello all, I have a problem with Petticoats, they always go flat and I'm tired of having to wear like two, do any of you use those like birdcage underpinnings rather than petticoats? Do they work better or do they make the shape of the skirt awkward? http://www.fanplusfriend.com/servlet/the-2078/Gothic-Steampunk-Full-Birdcage/Detail Something of that nature. Thanks!