Light weight sleeping bag substitute

I posted most of this elsewhere but wanted to make contribution here. I made a polarfleece quilt for those overnighters where the minimum temps will be well north of 15degrees or so.
Spotlight supplied 2100mm of 210gsm Polafleece at $5.99 a metre. Resident expert folded edges to middle then sewed the bottom, then closed the first 300mm from the bottom to form a footbox. Used quilt style (split to the bottom), I slide the mat into the footpocket, lie on the mat with the feet in the footbox and pull the rest of the quilt up over the body as you would a blanket or quilt. I knocked 200mm off the width of the Polafleece (finished width 1700mm) and turned the top 75mm for a finished length of 1900mm. Weight comes in around the 600grams but I have not weighed it accurately yet. Stuffs well and I will have to make a custom compression bag to get minimum size for the pack.
Should be able to use this thing as an over bag in the cold to squeeze an extra couple of degrees out of the proper sleeping bag, especially if I make a nylon cover for it.
I already take a merino top, fleece vest, spare socks, and a rain jacket as emergency gear anyway so I should be able to get comfortable, in the tent, down to 6-8 overnight without concern.
I'm now seriously looking at a sub 7Kg pack, before water, for an overnighter.
Ticklebelly
Spotlight supplied 2100mm of 210gsm Polafleece at $5.99 a metre. Resident expert folded edges to middle then sewed the bottom, then closed the first 300mm from the bottom to form a footbox. Used quilt style (split to the bottom), I slide the mat into the footpocket, lie on the mat with the feet in the footbox and pull the rest of the quilt up over the body as you would a blanket or quilt. I knocked 200mm off the width of the Polafleece (finished width 1700mm) and turned the top 75mm for a finished length of 1900mm. Weight comes in around the 600grams but I have not weighed it accurately yet. Stuffs well and I will have to make a custom compression bag to get minimum size for the pack.
Should be able to use this thing as an over bag in the cold to squeeze an extra couple of degrees out of the proper sleeping bag, especially if I make a nylon cover for it.
I already take a merino top, fleece vest, spare socks, and a rain jacket as emergency gear anyway so I should be able to get comfortable, in the tent, down to 6-8 overnight without concern.
I'm now seriously looking at a sub 7Kg pack, before water, for an overnighter.
Ticklebelly