Try a flat rate box. Put a garbage bag in it, fold your quilt to its dimensions and set it inside. Use a vaccum cleaner hose to suck the air out of it. It will squish soooo much. Twist the garbage bag, and then tape the box shut super quick!! I ship cloth diapers regularly and it's almost always cheaper to use this method with flat rate shipping. Paying on USPS.com or PayPal is cheaper than in the po as well. You can order regional rate boxes from USPS.com and that is sometimes cheaper.