i have a pertex quantum .9 down bag. it has a foot long rip on the outside of the bag, running along the middle of one of its baffled tubes.
searching bpl i could only find discussion repairing small rips or burn holes.
how would i best go about repairing this foot long wound?
step 2 of this website http://www.ehow.com/how_118011_fix-torn-sleeping.html says to sew it 1/4 from the rip with a spiraling sew job. do yall think this would be fine for a .9 quantum fabric? or would i need to line the side with tape and then sew it?
thanks for the help.

