So...I got a couple of down mummy sleeping bags free (thank you Auntie Jane) and I've used them as TQ and UQs. I need some help dialing it in. I'm putting these photos in. I sewed the foot end with a channel for shock cord. That end is pretty cake. The middle is a bit loose, but ok. The head end is a bit wonky. I didn't want to trim it straight to avoid more sewing. It already had cord in the channels to snug, but one sode is wider as the "pillow" part of the mummy sack.
Any ideas from folks that have tried this, or just enjoy analyzing and problemsolving?-