The supermarkets in my area have only their house brands, and all are scented. In light of the warnings that all scents should be kept away from bears, it doesn't sound like a good idea to use those. I have no idea if the scent would actually attract a bear, but it certainly repels me!
I gave up on trash compactor bags because every time I'd shove small items down to fill a hole in my pack, they would pop right back out thanks to the slippery plastic. I now use two dry bags, one for my sleeping bag and another for my insulating clothing. They actually weigh a little less than a trash compactor bag. The change speeded up my morning packing by several minutes, in addition to not raising my blood pressure.
YMMV, of course!