Yeah - I fold them over the skin saver, then fold em again etc. I guess I am just doing a simple fold from 1 foot to 6" rather than rolling them. Good tip about not storing them in the bag - one more thing to upset my wife when she opens the spare bedroom cupboard to see skins hanging next to her nice dresses!!

I don't know how you're trying to get it done so I'll just describe my technique. Fold 'em in half over the skin saver first (tip to tail). Then fold again, and again, as flat as possible until they're about a foot long. Then roll 'em and squeeze 'em and they should stuff in their bag with a bit of work. I was taught to not store skins in the sack and to keep 'em flat and in a cool spot. I generally only bag mine if they're going to be tossed into the trunk of a car. I don't bother with the sack when out on tours. Too much to fiddle around with when my hands are cold. I hope this helps!