We currently use king size sleeping bags zipped together, but as someone else said, they are a bear to wash and dry (not to mention it's expensive taking them to the laundromat since no way will our home washing machine accommodate them.) And so I'm going to use the great idea suggested by another portal member and make a liner by sewing two sheets together at the bottom and then partway up the sides. However, I'm wondering how to keep the liner where it belongs rather than getting scrunched down or sideways? My DH is a "thrasher" and unless I bolt down that liner somehow, it will be a mess every morning. Any ideas?