Does this product contain a zipper, and if so, does it completely open up into a rectangular double wide blanket. If so, can it be zipped together with another rectangular sleeping bag so that this product is the bottom, and the heavier bag as the top cover?
CHRISTINA G This doesn't have a zipper at all. It's a simple thin (blouce fabric) sack made of silk fabric.
ALLAN G The Grand Trunk silk sleeping sack does not have zippers. Both sides are sewn together up to about 3/5's the way up. From there it is open. There are 2 sets of strings on either side which you tie to close.
DESIREE S Sleep sack does not have a zipper.
JEAN S Douglas - The product does not have a zipper and it does not open all the way into a rectangular blanket. It open half way on both sides and has little ends that can tie together on the top of the open sections.