I have bought bags before to wash my bras in but I was not happy because they were just that- bags. They helped keep the bras from getting stretched but without and form I found my bras were still getting damaged and losing their shape in the laundry. I love these bags because they are like little roll cages for my bras, they actually have a frame inside that is stiff and holds up in the wash! They are collapsible but not flimsy and after washing my bras once now with them I can tell any girl wondering that this is a brilliant design concept and IT WORKS! Bras are too expensive to ruin in the wash; now I can zip them up, toss them in, and forget about it- love them!!