Personally I think all this hand washing, do-not-tumble-dry stuff is totally unnecessary. I've always machine washed and tumble dried, without one of the little bags, and my bras last a fair while before they show wear, have underwires break, or get too loose. Although the hooks do occasionally get caught in other clothing, creating pulls in the clothes, and bending the hooks. Seriously, I'm lazy as fuck. Even if my bras fell apart after 3 months due to machine washing, I'd still think it worth it to machine wash. But the ones I get, don't. I tend to buy practical bras, rather than pretty, delicate bras though, so maybe that's why I can get away with the machine washing/tumble drying.