Lazy Lightningwrote a review of Sea To Summit Seam Sealed Stuff Sack on April 11, 2014
Familiarity: I've used it once or twice and have initial impressions
I bought 2 of these in size Large for my full length 0 degree hammock top quilt and under quilt, both with about 3.5" of loft. The quilts stuff in easily with good compression but not so much that it crushes the down.
I usually go for the ultralight silnylon stuff sacks, but at 2.3 oz on my scale these offer better protection and can be used as sturdy gear storage bags clipped to my hammock.