i have an old mummy bag rated down to -10f and i was wondering if i could some how modify it to do something kinda like this? http://store.grandtrunkgoods.com/hammocks/sleeping-bag
if not, is there a way i can use the mummy bag to make an under quilt. i also have another compact bag that i usually sleep in, but it's only rated to 40f. between the two, that should keep me warm enough...right?
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