My recommendation...condoms. Fill them with water (not completely full, you don't want them huge), tie them off at the end - sometimes it's better to double it (do another one over the top once the first is semi-frozen) You get a packet of them in the 2nd bounty bag at the hospital, so you could use them or just buy a pack - I didn't need them this time round, cause fantastically I had no swelling or pain down there which I was not expecting and was so stoked about. But I have a few friends who have done it and they work well - and when you're not quite so tender inside, you can lube them slightly and insert them too, if you want, so that it takes care of the swelling and pain just inside. Or you just pop them into your undies like you would the normal ice packs at the hospital.