Can anyone recommend a decent sized mattress protector? We just got a new mattress a couple of months ago and don't want to ruin it by my waters breaking in bed. I've looked in chemists but they only seem to have tiny little things (60cm x 60cm) about the same size as a puppy training pad and they just seem too small! I think my best bet is to go for something that would cover a double mattress as I tend to sprawl out all over the bed :o