These are excellent bags - they work like a stuff sac for a sleeping bag ie you need to "stuff" the wet costume inside them and pull the cord. I can easily fit my costume, my daughter's costume and her quite bulky swim nappy in one bag. They stop the towels getting so wet, so when we get home, the towels dry very quickly (saving me drying space). It's a very sturdy little bag - have been using for over a year now, swimming weekly - and quickly dries turned inside out. I'm now buying one for a present for my friend who swims regularly too (and likes pink!!).