I've bought some beautiful new goose down pillows, with box sides, so they're quite deep. I've squashed them into my existing pillow cases, but it's made them feel quite firm as there's not really enough room and the pillows have become compressed, if that makes sense. I've looked on the internet but can't see any pillowcases with box sides, but I'm wondering if anybody else has solved this problem. All help gratefully received.