I just recieved a catalog from sportsmans guide and they have 2 sleeping bags with what they are calling an over cover. It is a quilted piece that is attached to the top of your sleeping bag to increase its warmth. As i looked at it i realized it could easily be used for either an under or over quilt in any hammock. Tha best is the price. $89.00 dollars and they consider it a -10 degree bag. Not a bad price for a 2 in one deal. I would have had the link for it here but i'm pretty much computer illiterate, sorry.